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Datasheet

Xanthium spinosum

Summary

  • Last modified
  • 03 April 2014
  • Datasheet Type(s)
  • Invasive Species
  • Pest
  • Host Plant
  • Preferred Scientific Name
  • Xanthium spinosum
  • Preferred Common Name
  • bathurst burr
  • Taxonomic Tree
  • Domain: Eukaryota
  •     Kingdom: Plantae
  •         Phylum: Spermatophyta
  •             Subphylum: Angiospermae
  •                 Class: Dicotyledonae
  • Summary of Invasiveness
  • X. spinosum is a highly invasive plant classified as one of the world’s worst weeds, and is now widely distributed throughout many regions of the world, where it is a common agricultural and pasture weed and a declared noxious species in many coun...

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Identity

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Preferred Scientific Name

  • Xanthium spinosum L.

Preferred Common Name

  • bathurst burr

Other Scientific Names

  • Acanthoxanthium spinosum (L.) Fourr.
  • Xanthium catharticum Kunth
  • Xanthium ambrosioides Hook. & Arn.

International Common Names

  • English: bathurst burr; dagger cocklebur; daggerweed; prickly burweed; spiny burweed; spiny clotburr; spiny cocklebur; thorny burweed
  • Spanish: cachurerra menor; cadillo; pegotes
  • French: lampourde épineuse
  • Portuguese: carrapichao; gatinhos; pica-tres

Local Common Names

  • Brazil: carrapicho-de-Santa-Helena; espinho de carneiro
  • Chile: abrojo; cepacaballo; clonqui; concli
  • Germany: Dornige Spitzklette
  • Iran: burweed
  • Italy: Lappola spinosa
  • Namibia: spiny cocklebur
  • Netherlands: gedoornde Stekelnoot
  • South Africa: boetebos
  • Sweden: tistelgullfro
  • USA: cocklebur; spiny clotbur; spiny cocklebur

EPPO code

  • XANSP (Xanthium spinosum)

Summary of Invasiveness

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X. spinosum is a highly invasive plant classified as one of the world’s worst weeds, and is now widely distributed throughout many regions of the world, where it is a common agricultural and pasture weed and a declared noxious species in many countries. Originating in South America, it has spread widely, probably via its spiked seeds which attach to animals and clothing or are a contaminant of hay or other products. It produces prolific amounts of seed that germinate easily. X. spinosum can quickly dominate large areas, outcompeting crops, forage plants and native flora. Control is possible but requires significant effort. There is considerable ongoing research into various methods including biological control.

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Plantae
  •         Phylum: Spermatophyta
  •             Subphylum: Angiospermae
  •                 Class: Dicotyledonae
  •                     Order: Asterales
  •                         Family: Asteraceae
  •                             Genus: Xanthium
  •                                 Species: Xanthium spinosum

Notes on Taxonomy and Nomenclature

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X. spinosum is one of only two accepted species of Xanthium, the other being X. strumarium. The many other reported species in the literature were brought into synonymy by Love and Dansereau (1959). X. strumarium is a very variable species whereas X. spinosum is more homogeneous throughout its range. It is thought that the two species can hybridize. Although native to South America, the type specimen for X. spinosum is from Portugal.

Xanthium comes from the Greek word xanthos meaning the colour yellow and is thought to refer to the yellow dye extracted from some taxa (Parsons, 1973). The plant is known by a number of common names, of which Bathurst burr, spiny cocklebur, cocklebur and spiny clotbur are often seen in the English language literature. However, cocklebur is also sometimes used to refer to X. strumarium.

Description

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Adapted from Pitcher (1989):

X. spinosum is a much branched annual herb, generally erect and somewhat woody, often 0.3-0.6 m in height, but sometimes up to 1 m tall and 1.5 m across. Stems are striate, yellowish or brownish grey and finely pubescent. True leaves are lanceolate, entire, irregularly toothed or lobed, mostly three-lobed with the center lobe much longer than the other two, 3-8 cm long, 0.6-2.6 cm wide. They are hairy (glabrous or strigose) and a dull grey-green colour above, and paler and downy (silvery-tomentulose) beneath, with a conspicuous white midrib, and each on short petioles approximately 1 cm long. Each leaf base is armed at the axil with three-pronged yellow spines usually up to 2.5 cm long, often opposite in pairs.

Flower heads are in axillary clusters or solitary. Flowers are inconspicuous, greenish, and monoecious; male flowers in almost globular heads in axils of upper most leaves, and female flowers in axils of lower leaves, developing into a burr. The burr is two-celled, oblong, nearly egg-shaped, slightly flattened, 10-13 mm long, 4 mm wide, pale yellowish to brown covered with yellowish hairs, more or less striate, glandular, covered with numerous slender, hooked, glabrous spines up to 3 mm long from more or less thickened bases, with the two apical beaks short and straight. Each burr contains two flattened, thick-coated, dark brown or black seeds, about 1 cm long, the lower germinating first.

Plant Type

Top of pageAnnual
Broadleaved
Herbaceous
Seed propagated

Distribution

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There appears to be disagreement over the native range of X. spinosum, though it is certain to have originated from South America. Some sources have suggested Chile, whereas others suggest a broader area that also includes at least Argentina, and possibly also other countries, which may be more probable. The native range proposed by USDA-ARS (2013) is used here, which includes Argentina, Bolivia, Chile, Ecuador, Peru, Uruguay and southern Brazil, though it also confirms that the limits of native range are obscure. Pitcher (1989) stated that X. spinosum had been introduced to at least 39 countries, though records for many more are available and the real figure may be higher still. It is widely distributed in the Mediterranean region, Europe, Australia, parts of Africa, South America and North America, though is only rarely found in the tropics (Holm et al., 1977).

Distribution Table

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CountryDistributionLast ReportedOriginFirst ReportedInvasiveReferencesNotes

ASIA

AfghanistanPresentIntroducedUSDA-ARS, 2013
ArmeniaPresentIntroducedUSDA-ARS, 2013
AzerbaijanPresentIntroducedUSDA-ARS, 2013
ChinaPresentIntroducedUSDA-ARS, 2013; Missouri Botanical Garden, 2013
-BeijingPresentIntroducedUSDA-ARS, 2013; Missouri Botanical Garden, 2013
-HenanPresentIntroducedUSDA-ARS, 2013; Missouri Botanical Garden, 2013
-XinjiangPresentInvasiveDu et al., 2012; Song et al., 2012
Georgia (Republic of)PresentIntroducedUSDA-ARS, 2013
IndiaPresentIntroducedBaburaj et al., 1994; CAB Abstracts
-Tamil NaduPresentIntroduced1994Baburaj et al., 1994First record, in the Nilgiri mountains
IranPresentIntroducedInvasiveUSDA-ARS, 2013; Mirshekari & Siyami, 2013Reported weed in Tabriz
IsraelPresentIntroducedUSDA-ARS, 2013
JapanPresentIntroducedPIER, 2013
JordanPresentIntroducedUSDA-ARS, 2013
KazakhstanPresentIntroducedUSDA-ARS, 2013
KyrgyzstanPresentIntroducedUSDA-ARS, 2013
LebanonPresentIntroducedUSDA-ARS, 2013
NepalPresentIntroducedGBIF, 2013
Saudi ArabiaPresentIntroducedGBIF, 2013
SyriaPresentIntroducedUSDA-ARS, 2013; USDA-ARS, 2013
TajikistanPresentIntroducedUSDA-ARS, 2013
TurkeyPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
TurkmenistanPresentIntroducedUSDA-ARS, 2013
UzbekistanPresentIntroducedUSDA-ARS, 2013
YemenPresentIntroducedUSDA-ARS, 2013

AFRICA

AlgeriaPresentIntroducedInvasiveUSDA-ARS, 2013
BotswanaPresentIntroducedUSDA-ARS, 2013
EgyptPresentIntroducedInvasiveEl-Metwally & Ahmed, 2001; USDA-ARS, 2013
EritreaPresentIntroducedUSDA-ARS, 2013
EthiopiaPresentIntroducedUSDA-ARS, 2013
LesothoPresentIntroducedGBIF, 2013
LibyaPresentIntroducedUSDA-ARS, 2013
MauritiusPresentIntroducedUSDA-ARS, 2013
MoroccoPresentIntroducedGBIF, 2013
NamibiaPresentIntroducedInvasiveBethune et al., 2004Central and eastern regions
RéunionPresentIntroducedUSDA-ARS, 2013
South AfricaPresentIntroducedUSDA-ARS, 2013; Missouri Botanical Garden, 2013
SpainRoyal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013
-Canary IslandsPresentIntroducedUSDA-ARS, 2013
ZimbabwePresentNativeUSDA-ARS, 2013

NORTH AMERICA

CanadaPresentIntroducedInvasiveMissouri Botanical Garden, 2013; USDA-ARS, 2013; USDA-NRCS, 2013
-New BrunswickPresentIntroducedUSDA-NRCS, 2013
-OntarioPresentIntroducedUSDA-NRCS, 2013; Missouri Botanical Garden, 2013
-QuebecPresentIntroducedUSDA-NRCS, 2013
-SaskatchewanPresentIntroducedUSDA-NRCS, 2013
MexicoPresentIntroducedUSDA-ARS, 2013
USAWidespreadIntroducedInvasiveUSDA-ARS, 2013; USDA-NRCS, 2013
-AlabamaPresentIntroducedInvasiveUSDA-NRCS, 2013
-ArizonaPresentIntroducedInvasiveUSDA-NRCS, 2013
-CaliforniaPresentIntroducedInvasiveUSDA-NRCS, 2013; Missouri Botanical Garden, 2013
-ColoradoPresentIntroducedInvasiveUSDA-NRCS, 2013
-ConnecticutPresentIntroducedInvasiveUSDA-NRCS, 2013
-DelawarePresentIntroducedInvasiveUSDA-NRCS, 2013
-District of ColumbiaPresentIntroducedInvasiveUSDA-NRCS, 2013
-FloridaPresentIntroducedInvasiveUSDA-NRCS, 2013
-GeorgiaPresentIntroducedInvasiveUSDA-NRCS, 2013
-IdahoPresentIntroducedInvasiveUSDA-NRCS, 2013
-IllinoisPresentIntroducedInvasiveUSDA-NRCS, 2013
-IndianaPresentIntroducedInvasiveUSDA-NRCS, 2013
-IowaPresentIntroducedInvasiveUSDA-NRCS, 2013
-KansasPresentIntroducedInvasiveUSDA-NRCS, 2013; Missouri Botanical Garden, 2013
-KentuckyPresentIntroducedInvasiveUSDA-NRCS, 2013
-MainePresentIntroducedInvasiveUSDA-NRCS, 2013
-MarylandPresentIntroducedInvasiveUSDA-NRCS, 2013
-MassachusettsPresentIntroducedInvasiveUSDA-NRCS, 2013
-MichiganPresentIntroducedInvasiveUSDA-NRCS, 2013
-MississippiPresentIntroducedInvasiveUSDA-NRCS, 2013
-MissouriPresentIntroducedInvasiveUSDA-NRCS, 2013
-MontanaPresentIntroducedInvasiveUSDA-NRCS, 2013
-NebraskaPresentIntroducedInvasiveUSDA-NRCS, 2013; Missouri Botanical Garden, 2013
-NevadaPresentIntroducedInvasiveUSDA-NRCS, 2013
-New HampshirePresentIntroducedInvasiveUSDA-NRCS, 2013
-New JerseyPresentIntroducedInvasiveUSDA-NRCS, 2013
-New MexicoPresentIntroducedInvasiveUSDA-NRCS, 2013
-New YorkPresentIntroducedInvasiveUSDA-NRCS, 2013
-North CarolinaPresentIntroducedInvasiveUSDA-NRCS, 2013; Missouri Botanical Garden, 2013
-OhioPresentIntroducedInvasiveUSDA-NRCS, 2013
-OregonPresentIntroducedInvasiveUSDA-NRCS, 2013
-PennsylvaniaPresentIntroducedInvasiveUSDA-NRCS, 2013
-Rhode IslandPresentIntroducedInvasiveUSDA-NRCS, 2013
-South CarolinaPresentIntroducedInvasiveUSDA-NRCS, 2013
-TennesseePresentIntroducedInvasiveUSDA-NRCS, 2013
-TexasPresentIntroducedInvasiveUSDA-NRCS, 2013; Missouri Botanical Garden, 2013
-UtahPresentIntroducedInvasiveUSDA-NRCS, 2013
-VirginiaPresentIntroducedInvasiveUSDA-NRCS, 2013
-WashingtonPresentIntroducedInvasiveUSDA-NRCS, 2013
-West VirginiaPresentIntroducedInvasiveUSDA-NRCS, 2013

SOUTH AMERICA

ArgentinaPresentNativeInvasiveMissouri Botanical Garden, 2013; USDA-ARS, 2013; Istilart, 2005
BoliviaPresentNativeUSDA-ARS, 2013; Missouri Botanical Garden, 2013
BrazilPresentNativeUSDA-ARS, 2013; Missouri Botanical Garden, 2013
-Rio Grande do SulPresentNativeUSDA-ARS, 2013
-Santa CatarinaPresentNativeUSDA-ARS, 2013
ChilePresentNativePIER, 2013; USDA-ARS, 2013
ColombiaPresentMissouri Botanical Garden, 2013
EcuadorPresentNativeUSDA-ARS, 2013; Missouri Botanical Garden, 2013
ParaguayPresentNativeUSDA-ARS, 2013
PeruPresentNativeGBIF, 2013; USDA-ARS, 2013
UruguayPresentNativeOlano et al., 1996; USDA-ARS, 2013

EUROPE

AlbaniaPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
AustriaPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
BelgiumPresentIntroducedGBIF, 2013
BulgariaPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
CroatiaPresentIntroducedGBIF, 2013
Czech RepublicPresentIntroducedGBIF, 2013
Czechoslovakia (former)PresentIntroducedRoyal Botanic Garden Edinburgh, 2013
DenmarkPresentIntroducedGBIF, 2013
FinlandPresentIntroducedGBIF, 2013
FrancePresentIntroducedRoyal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013
GermanyPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
GreecePresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
HungaryPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013
ItalyPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013
LuxembourgPresentIntroducedGBIF, 2013
MacedoniaPresentIntroducedGBIF, 2013
MoldovaPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
NetherlandsPresentIntroducedGBIF, 2013
NorwayPresentIntroducedGBIF, 2013
PolandPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013; USDA-NRCS, 2013
PortugalPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
-AzoresPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
RomaniaPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
Russian FederationPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
-Central RussiaPresentIntroducedUSDA-ARS, 2013European part
-Northern RussiaPresentIntroducedUSDA-ARS, 2013European part
-Russian Far EastPresentIntroducedUSDA-ARS, 2013Primoye
-Southern RussiaPresentIntroducedUSDA-ARS, 2013European part
SlovakiaPresentIntroducedGBIF, 2013
SpainPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013
-Balearic IslandsPresentIntroducedRoyal Botanic Garden Edinburgh, 2013
SwedenPresentIntroducedGBIF, 2013
SwitzerlandPresentIntroducedRoyal Botanic Garden Edinburgh, 2013; GBIF, 2013
UKPresentIntroducedGBIF, 2013
UkrainePresentIntroducedRoyal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013
Yugoslavia (former)PresentIntroducedRoyal Botanic Garden Edinburgh, 2013

OCEANIA

AustraliaPresentIntroducedInvasivePIER, 2013
-Australian Northern TerritoryPresentIntroducedInvasiveRoyal Botanic Gardens Sydney, 2013; PIER, 2013
-New South WalesPresentIntroducedInvasiveHolm et al., 1977; Royal Botanic Gardens Sydney, 2013; PIER, 2013
-QueenslandPresentIntroducedInvasiveRoyal Botanic Gardens Sydney, 2013; PIER, 2013
-South AustraliaWidespreadIntroducedRoyal Botanic Gardens Sydney, 2013Eastern parts of the state
-TasmaniaLocalisedIntroducedRoyal Botanic Gardens Sydney, 2013
-VictoriaWidespreadIntroducedRoyal Botanic Gardens Sydney, 2013
-Western AustraliaPresentIntroducedGardner & Meadly, 1947; Royal Botanic Gardens Sydney, 2013
FijiPresentIntroducedPIER, 2013Viti Levu Island
KiribatiPresentIntroducedPIER, 2013Teraina (Washington) Island
New ZealandPresentIntroducedInvasivePIER, 2013; USDA-ARS, 2013
Papua New GuineaPresentIntroducedInvasiveHolm et al., 1977; USDA-ARS, 2013Eastern New Guinea Island

History of Introduction and Spread

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There are limited records regarding dates of introduction, though considering the ease of accidental introduction, X. spinosum seed may have started spreading a long time ago, following trade in livestock and other agricultural and forage commodities. Gardener and Meadley (1947) noted that it had only recently appeared in Western Australia, though it may have already been present elsewhere in Australia long before this. The first record in India appears to be in the Nilgiri Hills area of Tamil Nadu in 1994, and the first record in Xinjiang province in western China was in 2009. X. spinosum continues to spread.

Introductions

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Introduced toIntroduced fromYearReasonIntroduced byEstablished in wild throughReferencesNotes
Natural reproductionContinuous restocking
Tamil Nadu Baburaj et al., 1994Noted in the Niligiri mountains
Western Australiaearly 1940sGardner & Meadly, 1947Noted as 'recently apprearing' in 1947
Xinjiang2009Song et al., 2012

Risk of Introduction

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X. spinosum has all the attributes that make accidental introduction very likely, and it has already been introduced to so many countries it is likely to spread further. Noting its recent arrival in western China, further spread into Central Asia may be expected in the future, for example.

Habitat

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X. spinosum can be found growing in a wide variety of habitats. Holm et al. (1977) described X. spinosum as mainly a pasture or meadow weed, growing along roads and in disturbed areas and abandoned fields, also being sometimes common around waterholes and along floodplains, canals, ditches, creek flats, river terraces, and other moist places. It can also be common weed in cultivated fields, stock yards and abandoned settlements. In New Zealand it is noted in ‘waste places, coastal sites, pasture, cultivated land, gardens’ (PIER, 2013), whereas in Namibia, light to moderate infestations are observed along rivers and in disturbed agricultural areas such as cattle pens (Bethune et al., 2004). In Australia Parsons and Cuthbertson (1992) state its wide distribution is due in part to its ability to adapt to a range of climatic conditions and to thrive where the soil has been disturbed, allowing it to grow in pasture, wasteland, sheep camps, as well as coastal areas, watercourses, dam banks and floodplains. Where it is recently invasive in western China, it is also reported to occur in desert grassland and oases (Song et al., 2012).

Habitat List

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CategoryHabitatPresenceStatus
Littoral
Coastal areasSecondary/tolerated habitatHarmful (pest or invasive)
Terrestrial-managed
Cultivated / agricultural landPrincipal habitatHarmful (pest or invasive)
Disturbed areasPrincipal habitatHarmful (pest or invasive)
Industrial / intensive livestock production systemsPrincipal habitatHarmful (pest or invasive)
Managed grasslands (grazing systems)Principal habitatHarmful (pest or invasive)
Rail / roadsidesSecondary/tolerated habitatHarmful (pest or invasive)
Terrestrial-natural/semi-natural
Arid regionsSecondary/tolerated habitatHarmful (pest or invasive)
DesertsSecondary/tolerated habitatHarmful (pest or invasive)
Natural grasslandsPrincipal habitatHarmful (pest or invasive)
RiverbanksSecondary/tolerated habitatHarmful (pest or invasive)
Scrub / shrublandsSecondary/tolerated habitatHarmful (pest or invasive)
WetlandsSecondary/tolerated habitatHarmful (pest or invasive)

Hosts/Species Affected

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X. spinosum is recorded as a weed of cotton, maize, mungbean, sorghum, soyabean, sugarbeet, sugarcane, sunflower and tomatoes, as well as many other annual and perennial crops.

Biology and Ecology

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Genetics

Both species of Xanthium are tetraploid with a chromosome number of 2n=36 (Love and Dansereau, 1959). Mitch (1987) provided detailed information on the origin, taxonomy, biology, identification, utilization, distribution and spread of both X. spinosum and X. strumarium. Both species may set seed without fertilization of the ovule, resulting in local populations where plants are genetically similar and may also differ only slightly from other populations.

Reproductive Biology

X. spinosum prefers moist soil and so seeds tend to germinate in late spring to late summer after early rains. Emergence can occur from spring until late autumn, and new fruits (or burrs) are produced two to three months after germination and emergence (Pitcher, 1989). Burrs have two elongated cavities, each containing a single seed, and an average of 150 seeds are produced by each plant.

The two seeds, however, have different characteristics. The lower of the two seeds has a shorter dormancy period, typically germinating a few months after maturity, whereas the upper seed can remain dormant for as long as eight years (Pitcher, 1989). This difference in dormancy may be due to site- and season-specific reasons (Auld, 1993), although the relative permeability of the seed coat to oxygen may also contribute, and high temperatures (32-38°C) can also overcome dormancy (Pitcher, 1989). Seed dormancy was not affected by partial fruit coat removal (Auld, 1993).

Optimal seedling emergence occurred when seeds were buried at depths of 1-4 cm, and was significantly reduced when buried to depths of 8 cm and deeper, and seeds in fruits placed on the soil surface failed to emerge entirely (Auld, 1993). In controlled environment studies and in the field, flowering was found to depend on day length, with flowering time decreasing with decreasing day length. Auld (1993) concluded that seed dormancy, the wide amplitude of seasonal emergence, the ability to flower quickly in cohorts and the ability of seed to germinate towards the end of the growing season could all potentially contribute to this plant’s success. Most plants die in the late autumn or early winter due to frost.

Associations

In the USA, Xanthium species are sometimes found growing with Arctium species, a European immigrant weed genus common in the USA.

Environmental Requirements

X. spinosum has proved remarkably adaptable to a wide range of climates and other environmental conditions, with the exception only of very cold polar/tundra conditions and very hot and dry or moist lowland tropical climates. In tropical regions it is generally only found at high altitudes. It appears to show no specific requirements regarding soil type.

Climate

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ClimateStatusDescriptionRemark
As - Tropical savannah climate with dry summerTolerated< 60mm precipitation driest month (in summer) and < (100 - [total annual precipitation{mm}/25])
Aw - Tropical wet and dry savanna climateTolerated< 60mm precipitation driest month (in winter) and < (100 - [total annual precipitation{mm}/25])
BS - Steppe climateTolerated> 430mm and < 860mm annual precipitation
BW - Desert climateTolerated< 430mm annual precipitation
C - Temperate/Mesothermal climatePreferredAverage temp. of coldest month > 0°C and < 18°C, mean warmest month > 10°C
Cf - Warm temperate climate, wet all yearPreferredWarm average temp. > 10°C, Cold average temp. > 0°C, wet all year
Cs - Warm temperate climate with dry summerPreferredWarm average temp. > 10°C, Cold average temp. > 0°C, dry summers
Cw - Warm temperate climate with dry winterPreferredWarm temperate climate with dry winter (Warm average temp. > 10°C, Cold average temp. > 0°C, dry winters)
D - Continental/Microthermal climatePreferredContinental/Microthermal climate (Average temp. of coldest month < 0°C, mean warmest month > 10°C)
Df - Continental climate, wet all yearPreferredContinental climate, wet all year (Warm average temp. > 10°C, coldest month < 0°C, wet all year)
Ds - Continental climate with dry summerPreferredContinental climate with dry summer (Warm average temp. > 10°C, coldest month < 0°C, dry summers)
Dw - Continental climate with dry winterPreferredContinental climate with dry winter (Warm average temp. > 10°C, coldest month < 0°C, dry winters)

Soil Tolerances

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Soil drainage

  • free
  • impeded

Soil reaction

  • acid
  • neutral

Soil texture

  • heavy
  • light
  • medium

Special soil tolerances

  • infertile
  • shallow

Natural Enemies

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Natural enemyTypeLife stagesSpecificityReferencesBiological control inBiological control on
Chondrostereum orbicularePathogen
Colletotrichum coccodesPathogen
Colletotrichum dematiumPathogen
Colletotrichum orbicularePathogenAustralia
Puccinia xanthiiPathogen

Means of Movement and Dispersal

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The fruit can be widely dispersed in a wide variety of ways. The fruits float and are readily dispersed by water and can spread rapidly along watercourses. The hooked spines on the fruit adhere easily and cling firmly to wool and animal fur, as well as also to clothing, bags and any fibrous material, hay bales, and also in mud on shoes, tools or vehicles. Fruits are also spread in contaminated pasture seed and grain (PIER, 2013).

Pathway Causes

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CauseNotesLong DistanceLocalReferences
Animal productionYesYesPIER, 2013
AquacultureYesYesPIER, 2013
Flooding/ other natural disasterYesPIER, 2013
Harvesting fur/wool/hairYesYesPIER, 2013
HitchhikerYesYesPIER, 2013
Seed tradeYesYesPIER, 2013

Pathway Vectors

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VectorNotesLong DistanceLocalReferences
Clothing/footwear and possessionsYesPIER, 2013
Hides/trophies/ feathersWoolYesYesPIER, 2013
Land vehiclesYesPIER, 2013
LivestockYesYesPIER, 2013
Machinery/equipmentYesPIER, 2013
Plants or parts of plantsYesYesPIER, 2013
WaterYesPIER, 2013

Plant Trade

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Plant parts liable to carry the pest in trade/transportPest stagesBorne internallyBorne externallyVisibility of pest or symptoms
True seeds (inc. grain)No

Impact Summary

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CategoryImpact
Economic/livelihoodNegative
Environment (generally)Negative

Impact

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X. spinosum is a highly invasive weed that is capable of growing under a range of environmental conditions. It readily establishes in cultivated land, pastures, meadows and riverbanks and can threaten native or endemic wildlife (Pitcher, 1989). Being highly invasive, X. spinosum can compete both directly and indirectly with native species, alter habitats and, when present on river banks, can increase soil erosion and affect water flow and quality.

It competes with agricultural crops such as soybeans and cotton, leading to a drastically reduced yields (Auld et al., 1999), and infestations in soybeans have been reported to cause severe yield losses of 60-70% (Mirshekari and Siyami, 2013). Furthermore, burrs can contaminate wool and other material due to their hooked spines, potentially affecting export.

In the seedling stage, X. spinosum is poisonous as the seeds contain hydroquinone. Plants at the cotyledon stage are also toxic as well as palatable to livestock, and plant parts remain toxic even after drying, though toxicity decreases rapidly as the first true-leaves develop (Mitch, 1987). The plant can be especially poisonous to pigs and horses (Pitcher, 1989). Ingestion of cotyledons to 0.75-1.5% of an animal's body weight causes toxicity within 12-48 hours, symptoms being nausea, vomiting, lassitude, depression, weakened muscles and prostration. Severe poisoning can result in convulsions and spasmodic running movements, and death may occur within a few hours or days. Fatty substances such as milk, lard or linseed oil have been recommended as antidotes (Pilcher, 1989).

Observations showed that X. spinosum is also an important interim host of broomrape (Orobanche/Phelipanche ramosa) (Wilhelm and Benson, 1955). Additionally, the weed can act as a host for a number of fungal diseases of plants including Sclerotina minor

X. spinosum is a declared noxious weed in 46 states of the USA (USDA-NRCS, 2013), including being a noxious weed in Arkansas, a Class B noxious weed in Oregon and a Class C noxious weed in Washington.

Risk and Impact Factors

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Impact mechanisms

  • Allelopathic
  • Competition - monopolizing resources
  • Interaction with other invasive species
  • Pest and disease transmission
  • Poisoning
  • Produces spines, thorns or burrs
  • Rapid growth

Impact outcomes

  • Damaged ecosystem services
  • Damages animal/plant products
  • Ecosystem change/ habitat alteration
  • Modification of hydrology
  • Modification of successional patterns
  • Monoculture formation
  • Negatively impacts agriculture
  • Negatively impacts animal health
  • Negatively impacts livelihoods
  • Negatively impacts trade/international relations
  • Reduced native biodiversity
  • Threat to/ loss of native species

Invasiveness

  • Abundant in its native range
  • Fast growing
  • Has a broad native range
  • Has high reproductive potential
  • Has propagules that can remain viable for more than one year
  • Highly adaptable to different environments
  • Highly mobile locally
  • Is a habitat generalist
  • Pioneering in disturbed areas
  • Proved invasive outside its native range

Likelihood of entry/control

  • Difficult to identify/detect as a commodity contaminant
  • Difficult/costly to control
  • Highly likely to be transported internationally accidentally

Uses

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The only recorded uses for X. spinosum are medicinal, as a diuretic. Plant extracts are used in popular medicine in Argentina (Amorin and Orfila, 1972).

Uses List

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Materials

  • Poisonous to mammals

Medicinal, pharmaceutical

  • Traditional/folklore

Similarities to Other Species/Conditions

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X. spinosum differs from X. strumarium by having much narrower leaves that taper at both ends, shorter petioles, conspicuous three-pronged spines at the leaf base and ovoid burrs covered with hooked thorns.

Prevention and Control

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Cultural Control

Due to the burrs adhering to wool, the risk of transferring seed to new areas can be reduced by shearing sheep before moving them from infected to clean pastures (Nursey, 1959). In Australia, X. spinosum is one of the most serious weeds spread by livestock, which carry burrs from one centre to another, so early recognition is essential for effective control (Gardner, 1942). Due to its toxicity and unpalatability, grazing is not a useful control method.

Physical/Mechanical Control

Control is possible by early mowing, cultivation or crop rotation, or by cutting and burning before the burrs ripen. As this annual weed spreads entirely by seed, it can be relatively easily controlled by cultivation on arable land, and on pastures. Eradication should aim to prevent seed development for at least three years (Orchard, 1949; Parsons, 1973). Single plants can be easily pulled out or hoed. If removal is done after flowering, it is important to burn the plants to ensure that the seeds are completely destroyed (Pitcher, 1989). Due to the long dormancy of the seeds, periodic repeated physical control will be required.

Chemical Control

The most common type of chemicals used to control X. spinosum are the broad-leaf selective herbicides. Young plants are easily killed by one application of 2,4-D or MCPA applied to healthy, growing, non-flowering plants, whereas older plants need more than one application (Meadley, 1956; Orchard, 1949). The most effective time for the application of 2,4-D is reported to be at the 3-5 leaf stage of growth, when it is able to better penetrate the waxy coat on the leaves (Pitcher, 1989), or before the flowering stage in February-March (Nursey, 1959). Imazaquin is also reported to be effective (Weber, 2003), and in irrigated soyabeans in New South Wales, Australia, imazaquin gave significantly more control of X. spinosum than bentazone, but did not control X. spinosum when applied after the formation of the 3 pronged spines (Andrews, 1993). However, Andrews (1993) considered that imazaquin provided the greater season-long control and was therefore the preferred herbicide.

Biological Control

The potential of using insects as a biological control agent has been assessed in Australia, India, Pakistan and United States, but with limited success (Pitcher, 1989). Investigations were conducted into the possibility of biological control by infection with the fungus Colletotrichum xanthii, a fungus which causes stem lesions (Orchard, 1949). The rust Puccinia xanthii was also found to attack several parts of the plant, reducing plant transpiration, burr production and seed germination (Pitcher, 1989).

The most effective mycoherbicide to date is Colletotrichum orbiculare. It can be applied in a similar way to herbicide applications and causes leaf and stem lesions, killing the plant in just 14 days under optimal conditions (Auld et al, 1988; 1990). Auld et al. (1990) undertook field applications of aqueous spore suspensions of 106 or 107 spores/ml at four sites, including a dryland pasture, an irrigated soyabean field and two sites where the effect of artificial dew was assessed using X. spinosum in pots in the field. Effectiveness was 50-100%, with the best results (98-100%) on the dryland grazing site. Providing an artificial dew period of 18 hours resulted in 100% mortality compared to only 50% under the natural dew period of 0.3 hours, with effectiveness correlated to humidity levels. It was considered that the formulation of a C. orbiculare spore suspension into a product with a low evaporation rate could play a significant role controlling X. spinosum (Auld et al., 1990).

Gaps in Knowledge/Research Needs

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X. spinosum has not been studied as thoroughly as X. strumarium. Further research is required regarding effective cultural and biological control.

References

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Amorin JL, Orfila EN, 1972. Xanthium spinosum L. (Compositae), a weed used in popular medicine in Argentina. Revista de la Facultad de Agronomia, Universidad Nacional de la Plata, 3a Epoca, 48:155-169.

Andrews JA, 1993. Control of Bathurst burr (Xanthium spinosum) in irrigated soybeans in southern New South Wales. Plant Protection Quarterly, 8(1):15-18.

Auld BA, 1993. Emergence and flowering in Xanthium spinosum. Agriculture, Ecosystems & Environment, 47(3):215-222.

Auld BA, McRae CF, Say MM, 1988. Possible control of Xanthium spinosum by a fungus. Agriculture, Ecosystems & Environment, 21(2-4):219-223.

Auld BA, Say MM, 1999. Comparison of isolates of Colletotrichum orbiculare from Argentina and Australia as potential bioherbicides for Xanthium spinosum in Australia. Agriculture, Ecosystems & Environment, 72(1):53-58.

Auld BA, Say MM, Ridings HI, Andrews J, 1990. Field applications of Colletotrichum orbiculare to control Xanthium spinosum. Agriculture, Ecosystems & Environment, 32(3-4):315-323.

Baburaj DS, Britto SJ, Michael P, 1994. Xanthium spinosum L.- a new record for Tamil Nadu. Journal of Economic and Taxonomic Botany, 18(1):235-238.

Bethune S, Griffin M, Joubert DF, 2004. National Review of Invasive Alien Species, Namibia. Windhoek, : Ministry of Environment and Tourism.

Clarke RG, Porter IJ, 1993. Sclerotinia minor - a pathogen of Bathurst burr (Xanthium spinosum). Australasian Plant Pathology, 22(3):98-99.

Du ZhenZhu, Xu WenBin, Yan Ping, Wang ShaoShan, Guo YiMin, 2012. Three newly recorded alien invasive plants of Xanthium in Xinjiang. Xinjiang Agricultural Sciences, 49(5):879-886. http://www.xjnykx.periodicals.com.cn

El-Metwally IM, Ahmed SA, 2001. Growth, yield and yield components of mungbean as affected by phosphorus levels and some weed control treatments. Annals of Agricultural Science, Moshtohor, 39(2):787-803.

Gardner CA, 1942. The Bathurst Burr. A serious noxious weed introduced with stock. Journal of the Department of Agriculture for Western Australia, 19:50-2.

Gardner CA, Meadly GRW, 1947. Bathurst burr. A serious noxious weed. Journal of the Department of Agriculture for Western Australia, 24:161-5.

GBIF, 2013. Global Biodiversity Information Facility. Global Biodiversity Information Facility (GBIF). http://data.gbif.org/species/

Hilgendorf JH, Goeden RD, 1983. Phytophagous insect faunas of spiny clotbur, Xanthium spinosum, and cocklebur, Xanthium strumarium, in southern California. Environmental Entomology, 12(2):404-411.

Holm LRG, Plucknett DL, Pancho JV, Herberger JP, 1977. The world's worst weeds. Distribution and biology. Honolulu, Hawaii, USA: University Press of Hawaii, 621 pp.

Istilart CM, 2005. Weed survey in sunflower in central-southern Buenos Aires province. In: XVII Congreso de la Asociación Latinoamericana de Malezas (ALAM) I Congreso Iberoamericano de Ciencia de las Malezas, IV Congreso Nacional de Ciencia de Malezas, Matanzas, Cuba, 8 al 11 de noviembre del 2005. Matanzas, Cuba: Asociación Latinoamericana de Malezas (ALAM), 712-713.

Love D, Dansereau P, 1959. Biosystematic studies on Xanthium: Taxonomic appraisal and ecological status. Canadian Journal of Botany, 37:173-208.

Meadly GRW, 1956. Weeds of Western Australia. Bathurst Burr (Xanthium spinosum L.). Journal of the Department of Agriculture for Western Australia, 5(2):161-3.

Mirshekari B, Siyami R, 2013. Determination of the best weeds control period in a soybean (Glycine max) new released hybrid: Williams. International Journal of Biosciences (IJB), 3(6):45-48. http://www.innspub.net/wp-content/uploads/2013/06/IJB-V3No6-p45-48.pdf

Missouri Botanical Garden, 2013. Tropicos database. St Louis, USA: Missouri Botanical Garden. http://www.tropicos.org/

Mitch LW, 1987. Cockleburs. Weed Technology, 1(4):359-360.

Nursey RW, 1959. Bathurst burr control. Past. Rev, 69(3):255.

Olano I, Alonso Paz E, Cerdeíras MP, Fernández J, Ferreira F, Moyna P, Soubes M, Vázquez A, Vero S, Bassagoda MJ, 1996. Screening of Uruguayan medicinal plants for antimicrobial activity. Part II. Journal of Ethnopharmacology, 53(2):111-115.

Orchard HE, 1949. Bathurst burr (Xanthium spinosum). Journal of the Department of Agriculture of South Australia, 58:218-20.

Parsons WT, 1973. Noxious Weeds of Victoria. Melbourne, Australia: Inkata Press Proprietary Ltd. 311 pp.

Parsons WT, Cuthbertson EG, 1992. Noxious Weeds of Australia. Melbourne, Australia: Inkata Press.

PIER, 2013. Pacific Islands Ecosystems at Risk. Honolulu, USA: HEAR, University of Hawaii. http://www.hear.org/pier/index.html

Pitcher D, 1989. Xanthium spinosum, Spiny Cocklebur. Element Stewardship Abstract. Arlington, USA: The Nature Conservancy, 10 pp.

Ramsar Sites Database, 1999. Information sheet on the Gwydir Wetlands: Australia. Summary., Australia. http://www.wetlands.org/reports/ris/5AU051en.pdf

Royal Botanic Garden Edinburgh, 2013. Flora Europaea, Database of European Plants (ESFEDS). Edinburgh, UK: Royal Botanic Garden Edinburgh. http://rbg-web2.rbge.org.uk/FE/fe.html

Royal Botanic Gardens Sydney, 2013. Australia’s Virtual Herbarium. Sydney, Australia: Royal Botanic Gardens. http://avh.chah.org.au/

Song ZhenZhen, Tan DunYan, Zhou GuiLing, 2012. Distribution and community characteristics of invasive Xanthium spinosum in Xinjiang. Acta Botanica Boreali-Occidentalia Sinica, 32(7):1448-1453. http://xbzwxb.nwsuaf.edu.cn

USDA-ARS, 2013. Germplasm Resources Information Network (GRIN). Beltsville, Maryland, USA: National Germplasm Resources Laboratory. http://www.ars-grin.gov

USDA-NRCS, 2013. The PLANTS Database. Baton Rouge, USA: National Plant Data Center. http://plants.usda.gov/

Weber E, 2003. Invasive plant species of the world: A reference guide to environmental weeds. Wallingford, UK: CAB International, viii + 548 pp.

Wilhelm S, Benson LC, 1955. Weeds as important interim hosts of broomrape. Plant Disease Reporter, 39(3):273.

Contributors

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13/11/13 Original text by:

Nick Pasiecznik, consultant, France

Distribution Maps

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Distribution map Afghanistan: Present, introduced
USDA-ARS, 2013Albania: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Armenia: Present, introduced
USDA-ARS, 2013Armenia: Present, introduced
USDA-ARS, 2013Argentina: Present, native, invasive
Missouri Botanical Garden, 2013; USDA-ARS, 2013; Istilart, 2005Austria: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Australia: Present, introduced, invasive
PIER, 2013Australia
See regional map for distribution within the countryAustralia
See regional map for distribution within the countryAustralia
See regional map for distribution within the countryAustralia
See regional map for distribution within the countryAustralia
See regional map for distribution within the countryAustralia
See regional map for distribution within the countryAustralia
See regional map for distribution within the countryAzerbaijan: Present, introduced
USDA-ARS, 2013Azerbaijan: Present, introduced
USDA-ARS, 2013Belgium: Present, introduced
GBIF, 2013Bulgaria: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Bolivia: Present, native
USDA-ARS, 2013; Missouri Botanical Garden, 2013Brazil: Present, native
USDA-ARS, 2013; Missouri Botanical Garden, 2013Brazil
See regional map for distribution within the countryBrazil
See regional map for distribution within the countryBotswana: Present, introduced
USDA-ARS, 2013Canada: Present, introduced, invasive
Missouri Botanical Garden, 2013; USDA-ARS, 2013; USDA-NRCS, 2013Canada
See regional map for distribution within the countryCanada
See regional map for distribution within the countryCanada
See regional map for distribution within the countryCanada
See regional map for distribution within the countrySwitzerland: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013Chile: Present, native
PIER, 2013; USDA-ARS, 2013China: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013China: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013China
See regional map for distribution within the countryChina
See regional map for distribution within the countryChina
See regional map for distribution within the countryColombia: Present
Missouri Botanical Garden, 2013Colombia: Present
Missouri Botanical Garden, 2013Czechoslovakia (former): Present, introduced
Royal Botanic Garden Edinburgh, 2013Czech Republic: Present, introduced
GBIF, 2013Germany: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Denmark: Present, introduced
GBIF, 2013Algeria: Present, introduced, invasive
USDA-ARS, 2013Algeria: Present, introduced, invasive
USDA-ARS, 2013Ecuador: Present, native
USDA-ARS, 2013; Missouri Botanical Garden, 2013Egypt: Present, introduced, invasive
El-Metwally & Ahmed, 2001; USDA-ARS, 2013Eritrea: Present, introduced
USDA-ARS, 2013Spain: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Spain: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Spain
See regional map for distribution within the countrySpain
See regional map for distribution within the countryEthiopia: Present, introduced
USDA-ARS, 2013Finland: Present, introduced
GBIF, 2013Fiji: Present, introduced
PIER, 2013France: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013UK: Present, introduced
GBIF, 2013Georgia (Republic of): Present, introduced
USDA-ARS, 2013Georgia (Republic of): Present, introduced
USDA-ARS, 2013Greece: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Greece: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Croatia: Present, introduced
GBIF, 2013Hungary: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Israel: Present, introduced
USDA-ARS, 2013Israel: Present, introduced
USDA-ARS, 2013India: Present, introduced
Baburaj et al., 1994India
See regional map for distribution within the countryIran: Present, introduced, invasive
USDA-ARS, 2013; Mirshekari & Siyami, 2013Iran: Present, introduced, invasive
USDA-ARS, 2013; Mirshekari & Siyami, 2013Iran: Present, introduced, invasive
USDA-ARS, 2013; Mirshekari & Siyami, 2013Italy: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Jordan: Present, introduced
USDA-ARS, 2013Jordan: Present, introduced
USDA-ARS, 2013Japan: Present, introduced
PIER, 2013Kyrgyzstan: Present, introduced
USDA-ARS, 2013Kiribati: Present, introduced
PIER, 2013Kazakhstan: Present, introduced
USDA-ARS, 2013Kazakhstan: Present, introduced
USDA-ARS, 2013Lebanon: Present, introduced
USDA-ARS, 2013Lebanon: Present, introduced
USDA-ARS, 2013Lebanon: Present, introduced
USDA-ARS, 2013Lesotho: Present, introduced
GBIF, 2013Luxembourg: Present, introduced
GBIF, 2013Libya: Present, introduced
USDA-ARS, 2013Morocco: Present, introduced
GBIF, 2013Morocco: Present, introduced
GBIF, 2013Moldova: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Macedonia: Present, introduced
GBIF, 2013Mauritius: Present, introduced
USDA-ARS, 2013Mexico: Present, introduced
USDA-ARS, 2013Mexico: Present, introduced
USDA-ARS, 2013Namibia: Present, introduced, invasive
Bethune et al., 2004Netherlands: Present, introduced
GBIF, 2013Norway: Present, introduced
GBIF, 2013Nepal: Present, introduced
GBIF, 2013New Zealand: Present, introduced, invasive
PIER, 2013; USDA-ARS, 2013Peru: Present, native
GBIF, 2013; USDA-ARS, 2013Papua New Guinea: Present, introduced, invasive
Holm et al., 1977; USDA-ARS, 2013Papua New Guinea: Present, introduced, invasive
Holm et al., 1977; USDA-ARS, 2013Poland: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013; USDA-NRCS, 2013Portugal: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Portugal
See regional map for distribution within the countryParaguay: Present, native
USDA-ARS, 2013Réunion: Present, introduced
USDA-ARS, 2013Romania: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Russian Federation: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Russian Federation: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Russian Federation
See regional map for distribution within the countryRussian Federation
See regional map for distribution within the countryRussian Federation
See regional map for distribution within the countryRussian Federation
See regional map for distribution within the countrySaudi Arabia: Present, introduced
GBIF, 2013Saudi Arabia: Present, introduced
GBIF, 2013Sweden: Present, introduced
GBIF, 2013Slovakia: Present, introduced
GBIF, 2013Syria: Present, introduced
USDA-ARS, 2013; USDA-ARS, 2013Syria: Present, introduced
USDA-ARS, 2013; USDA-ARS, 2013Syria: Present, introduced
USDA-ARS, 2013; USDA-ARS, 2013Tajikistan: Present, introduced
USDA-ARS, 2013Turkmenistan: Present, introduced
USDA-ARS, 2013Turkey: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Turkey: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Turkey: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Ukraine: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Ukraine: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013USA: Widespread, introduced, invasive
USDA-ARS, 2013; USDA-NRCS, 2013USA: Widespread, introduced, invasive
USDA-ARS, 2013; USDA-NRCS, 2013USA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUSA
See regional map for distribution within the countryUruguay: Present, native
Olano et al., 1996; USDA-ARS, 2013Uzbekistan: Present, introduced
USDA-ARS, 2013Yemen: Present, introduced
USDA-ARS, 2013Yemen: Present, introduced
USDA-ARS, 2013Yugoslavia (former): Present, introduced
Royal Botanic Garden Edinburgh, 2013South Africa: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013Zimbabwe: Present, native
USDA-ARS, 2013
  • = Present, no further details
  • = Evidence of pathogen
  • = Widespread
  • = Last reported
  • = Localised
  • = Presence unconfirmed
  • = Confined and subject to quarantine
  • = See regional map for distribution within the country
  • = Occasional or few reports
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Distribution map (asia) Afghanistan: Present, introduced
USDA-ARS, 2013Armenia: Present, introduced
USDA-ARS, 2013Azerbaijan: Present, introduced
USDA-ARS, 2013China: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013Beijing: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013Henan: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013Xinjiang: Present, invasive
Du et al., 2012; Song et al., 2012Georgia (Republic of): Present, introduced
USDA-ARS, 2013Israel: Present, introduced
USDA-ARS, 2013India: Present, introduced
Baburaj et al., 1994Tamil Nadu: Present, introduced
Baburaj et al., 1994Iran: Present, introduced, invasive
USDA-ARS, 2013; Mirshekari & Siyami, 2013Jordan: Present, introduced
USDA-ARS, 2013Japan: Present, introduced
PIER, 2013Kyrgyzstan: Present, introduced
USDA-ARS, 2013Kazakhstan: Present, introduced
USDA-ARS, 2013Lebanon: Present, introduced
USDA-ARS, 2013Nepal: Present, introduced
GBIF, 2013Papua New Guinea: Present, introduced, invasive
Holm et al., 1977; USDA-ARS, 2013Russian Federation: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Saudi Arabia: Present, introduced
GBIF, 2013Syria: Present, introduced
USDA-ARS, 2013; USDA-ARS, 2013Tajikistan: Present, introduced
USDA-ARS, 2013Turkmenistan: Present, introduced
USDA-ARS, 2013Turkey: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Ukraine: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Uzbekistan: Present, introduced
USDA-ARS, 2013Yemen: Present, introduced
USDA-ARS, 2013
Distribution map (europe) Albania: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Armenia: Present, introduced
USDA-ARS, 2013Austria: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Azerbaijan: Present, introduced
USDA-ARS, 2013Belgium: Present, introduced
GBIF, 2013Bulgaria: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Switzerland: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013Czechoslovakia (former): Present, introduced
Royal Botanic Garden Edinburgh, 2013Czech Republic: Present, introduced
GBIF, 2013Germany: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Denmark: Present, introduced
GBIF, 2013Algeria: Present, introduced, invasive
USDA-ARS, 2013Spain: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Balearic Islands: Present, introduced
Royal Botanic Garden Edinburgh, 2013Finland: Present, introduced
GBIF, 2013France: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013UK: Present, introduced
GBIF, 2013Georgia (Republic of): Present, introduced
USDA-ARS, 2013Greece: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Croatia: Present, introduced
GBIF, 2013Hungary: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Iran: Present, introduced, invasive
USDA-ARS, 2013; Mirshekari & Siyami, 2013Italy: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Kazakhstan: Present, introduced
USDA-ARS, 2013Lebanon: Present, introduced
USDA-ARS, 2013Luxembourg: Present, introduced
GBIF, 2013Morocco: Present, introduced
GBIF, 2013Moldova: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Macedonia: Present, introduced
GBIF, 2013Netherlands: Present, introduced
GBIF, 2013Norway: Present, introduced
GBIF, 2013Poland: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013; USDA-NRCS, 2013Portugal: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Azores: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Romania: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Russian Federation: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Central Russia: Present, introduced
USDA-ARS, 2013Russian Far East: Present, introduced
USDA-ARS, 2013Northern Russia: Present, introduced
USDA-ARS, 2013Southern Russia: Present, introduced
USDA-ARS, 2013Sweden: Present, introduced
GBIF, 2013Slovakia: Present, introduced
GBIF, 2013Syria: Present, introduced
USDA-ARS, 2013; USDA-ARS, 2013Turkey: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Ukraine: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Yugoslavia (former): Present, introduced
Royal Botanic Garden Edinburgh, 2013
Distribution map (africa) Botswana: Present, introduced
USDA-ARS, 2013Algeria: Present, introduced, invasive
USDA-ARS, 2013Egypt: Present, introduced, invasive
El-Metwally & Ahmed, 2001; USDA-ARS, 2013Eritrea: Present, introduced
USDA-ARS, 2013Spain: Present, introduced
Royal Botanic Garden Edinburgh, 2013; GBIF, 2013; USDA-ARS, 2013Canary Islands: Present, introduced
USDA-ARS, 2013Ethiopia: Present, introduced
USDA-ARS, 2013Greece: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Israel: Present, introduced
USDA-ARS, 2013Iran: Present, introduced, invasive
USDA-ARS, 2013; Mirshekari & Siyami, 2013Jordan: Present, introduced
USDA-ARS, 2013Lebanon: Present, introduced
USDA-ARS, 2013Lesotho: Present, introduced
GBIF, 2013Libya: Present, introduced
USDA-ARS, 2013Morocco: Present, introduced
GBIF, 2013Mauritius: Present, introduced
USDA-ARS, 2013Namibia: Present, introduced, invasive
Bethune et al., 2004Réunion: Present, introduced
USDA-ARS, 2013Saudi Arabia: Present, introduced
GBIF, 2013Syria: Present, introduced
USDA-ARS, 2013; USDA-ARS, 2013Turkey: Present, introduced
Royal Botanic Garden Edinburgh, 2013; USDA-ARS, 2013Yemen: Present, introduced
USDA-ARS, 2013South Africa: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013Zimbabwe: Present, native
USDA-ARS, 2013
Distribution map (north america) Canada: Present, introduced, invasive
Missouri Botanical Garden, 2013; USDA-ARS, 2013; USDA-NRCS, 2013New Brunswick: Present, introduced
USDA-NRCS, 2013Ontario: Present, introduced
USDA-NRCS, 2013; Missouri Botanical Garden, 2013Quebec: Present, introduced
USDA-NRCS, 2013Saskatchewan: Present, introduced
USDA-NRCS, 2013Mexico: Present, introduced
USDA-ARS, 2013USA: Widespread, introduced, invasive
USDA-ARS, 2013; USDA-NRCS, 2013Alabama: Present, introduced, invasive
USDA-NRCS, 2013Arizona: Present, introduced, invasive
USDA-NRCS, 2013California: Present, introduced, invasive
USDA-NRCS, 2013; Missouri Botanical Garden, 2013Colorado: Present, introduced, invasive
USDA-NRCS, 2013Connecticut: Present, introduced, invasive
USDA-NRCS, 2013District of Columbia: Present, introduced, invasive
USDA-NRCS, 2013Delaware: Present, introduced, invasive
USDA-NRCS, 2013Florida: Present, introduced, invasive
USDA-NRCS, 2013Georgia: Present, introduced, invasive
USDA-NRCS, 2013Iowa: Present, introduced, invasive
USDA-NRCS, 2013Idaho: Present, introduced, invasive
USDA-NRCS, 2013Illinois: Present, introduced, invasive
USDA-NRCS, 2013Indiana: Present, introduced, invasive
USDA-NRCS, 2013Kansas: Present, introduced, invasive
USDA-NRCS, 2013; Missouri Botanical Garden, 2013Kentucky: Present, introduced, invasive
USDA-NRCS, 2013Massachusetts: Present, introduced, invasive
USDA-NRCS, 2013Maryland: Present, introduced, invasive
USDA-NRCS, 2013Maine: Present, introduced, invasive
USDA-NRCS, 2013Michigan: Present, introduced, invasive
USDA-NRCS, 2013Missouri: Present, introduced, invasive
USDA-NRCS, 2013Mississippi: Present, introduced, invasive
USDA-NRCS, 2013Montana: Present, introduced, invasive
USDA-NRCS, 2013North Carolina: Present, introduced, invasive
USDA-NRCS, 2013; Missouri Botanical Garden, 2013Nebraska: Present, introduced, invasive
USDA-NRCS, 2013; Missouri Botanical Garden, 2013New Hampshire: Present, introduced, invasive
USDA-NRCS, 2013New Jersey: Present, introduced, invasive
USDA-NRCS, 2013New Mexico: Present, introduced, invasive
USDA-NRCS, 2013Nevada: Present, introduced, invasive
USDA-NRCS, 2013New York: Present, introduced, invasive
USDA-NRCS, 2013Ohio: Present, introduced, invasive
USDA-NRCS, 2013Oregon: Present, introduced, invasive
USDA-NRCS, 2013Pennsylvania: Present, introduced, invasive
USDA-NRCS, 2013Rhode Island: Present, introduced, invasive
USDA-NRCS, 2013South Carolina: Present, introduced, invasive
USDA-NRCS, 2013Tennessee: Present, introduced, invasive
USDA-NRCS, 2013Texas: Present, introduced, invasive
USDA-NRCS, 2013; Missouri Botanical Garden, 2013Utah: Present, introduced, invasive
USDA-NRCS, 2013Virginia: Present, introduced, invasive
USDA-NRCS, 2013Washington: Present, introduced, invasive
USDA-NRCS, 2013West Virginia: Present, introduced, invasive
USDA-NRCS, 2013
Distribution map (central america) Colombia: Present
Missouri Botanical Garden, 2013Mexico: Present, introduced
USDA-ARS, 2013USA: Widespread, introduced, invasive
USDA-ARS, 2013; USDA-NRCS, 2013Florida: Present, introduced, invasive
USDA-NRCS, 2013
Distribution map (south america) Argentina: Present, native, invasive
Missouri Botanical Garden, 2013; USDA-ARS, 2013; Istilart, 2005Bolivia: Present, native
USDA-ARS, 2013; Missouri Botanical Garden, 2013Brazil: Present, native
USDA-ARS, 2013; Missouri Botanical Garden, 2013Rio Grande do Sul: Present, native
USDA-ARS, 2013Santa Catarina: Present, native
USDA-ARS, 2013Chile: Present, native
PIER, 2013; USDA-ARS, 2013Colombia: Present
Missouri Botanical Garden, 2013Ecuador: Present, native
USDA-ARS, 2013; Missouri Botanical Garden, 2013Peru: Present, native
GBIF, 2013; USDA-ARS, 2013Paraguay: Present, native
USDA-ARS, 2013Uruguay: Present, native
Olano et al., 1996; USDA-ARS, 2013
Distribution map (pacific) Australia: Present, introduced, invasive
PIER, 2013Australian Northern Territory: Present, introduced, invasive
Royal Botanic Gardens Sydney, 2013; PIER, 2013New South Wales: Present, introduced, invasive
Holm et al., 1977; Royal Botanic Gardens Sydney, 2013; PIER, 2013Queensland: Present, introduced, invasive
Royal Botanic Gardens Sydney, 2013; PIER, 2013South Australia: Widespread, introduced
Royal Botanic Gardens Sydney, 2013Tasmania: Localised, introduced
Royal Botanic Gardens Sydney, 2013Victoria: Widespread, introduced
Royal Botanic Gardens Sydney, 2013Western Australia: Present, introduced
Gardner & Meadly, 1947; Royal Botanic Gardens Sydney, 2013China: Present, introduced
USDA-ARS, 2013; Missouri Botanical Garden, 2013Fiji: Present, introduced
PIER, 2013Kiribati: Present, introduced
PIER, 2013New Zealand: Present, introduced, invasive
PIER, 2013; USDA-ARS, 2013Papua New Guinea: Present, introduced, invasive
Holm et al., 1977; USDA-ARS, 2013