Microstegium vimineum (Nepalese browntop)
Index
- Pictures
- Identity
- Summary of Invasiveness
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Description
- Plant Type
- Distribution
- Distribution Table
- History of Introduction and Spread
- Introductions
- Risk of Introduction
- Habitat
- Habitat List
- Hosts/Species Affected
- Biology and Ecology
- Climate
- Latitude/Altitude Ranges
- Air Temperature
- Soil Tolerances
- Natural enemies
- Notes on Natural Enemies
- Means of Movement and Dispersal
- Pathway Causes
- Pathway Vectors
- Impact Summary
- Economic Impact
- Environmental Impact
- Risk and Impact Factors
- Uses
- Uses List
- Similarities to Other Species/Conditions
- Prevention and Control
- Gaps in Knowledge/Research Needs
- References
- Links to Websites
- Contributors
- Distribution Maps
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Top of pagePreferred Scientific Name
- Microstegium vimineum (Trinius) A. Camus1921 [1922]
Preferred Common Name
- Nepalese browntop
Other Scientific Names
- Andropogon vimineus Trin. 1832
- Arthraxon lanceolatus Miq. 1866
- Arthraxon nodosus Kom. 1901
- Eulalia cantonensis (Rendle) Hitchcock 1929 [1931]
- Eulalia vimenea (Trin.) Kuntze 1891
- Eulalia viminea (Trin.) Kuntze 1891
- Eulalia viminea var. imberbis (Nees ex Steud.) Kuntze 1891
- Eulalia viminea var. variabilis Kuntze 1891
- Microstegium aristulatum Robyns & Tournay 1955
- Microstegium cantonense (Rendle) A. Camus 1921 [1922]
- Microstegium debile (Balansa) A. Camus 1921 [1922]
- Microstegium dilatatum Koidzumi 1930
- Microstegium imberbe (Nees ex Steud.) Tzvelev 1961
- Microstegium nodosum (Kom.) Tzvelev; 1961
- Microstegium reticulatum B.S. Sun ex H. Peng & X. Yang 1996
- Microstegium vimineum fo. polystachyum (Melderis) T. Koyama 1971
- Microstegium vimineum subsp. nodosum (Kom.) Tzvelev 1976
- Microstegium vimineum var. monostachyum (Franch. & Sav.) Nakai 1952
- Microstegium vimineum var. polystachyum (Franch. & Sav.) Ohwi 1942
- Microstegium vimineum var. vimineum Bor 1960
- Microstegium vimineum var. willdenowianum (Nees ex Steud.) A. Camus 1922
- Microstegium vimineum var. willdenowianum (Nees ex Steud.) Sur 1985
- Microstegium willdenowianum Nees ex Steud. 1836
- Pollinia cantonensis Rendle 1904
- Pollinia debilis Balansa 1890
- Pollinia imberbis Nees ex Steud. 1855 [1854]
- Pollinia imberbis f. glabriflora
- Pollinia imberbis var. willdenowiana (Nees ex Steud.) Hack.1889
- Pollinia japonica var. polystachya Franch. & Sav. 1877
- Pollinia viminea (Trin.) Merr. 1922
- Pollinia willdenowiana (Nees ex Steud.) Benth. 1881
International Common Names
- English: Japanese stiltgrass; Nepalese browntop
Local Common Names
- China: rou zhi you zhu
- Japan: ashi-boso [slim foot]
- USA: annual jew grass; Asian stilt grass; bamboo grass; Chinese packing grass; eulalia; flexible sea grass; Japanese grass; Japanese stilt grass; Mary's grass; Nepal grass; Nepal microstegium; Vietnamese stilt grass
Summary of Invasiveness
Top of pageMicrostegium vimineum is a cosmopolitan annual (therophyte) C4 shade-tolerant grass of forest margins and moist grassy areas. It is native to Asia and is commonly referred to as Nepalese browntop or Japanese stilt grass (Raunkiær, 1934; Flora of China Editorial Committee, 2012). It was used as packing material for porcelain shipments from Asia to North America in the early twentieth century and was first collected in the USA in 1919 (Gage et al., 2010; Fryer, 2011; EPPO Executive Committee, 2012). The grass can form dense monocultures that crowd out native vegetation and proliferate in low light conditions. Once established, populations rapidly increase easily displacing native species within three to five years (Osborne and Edgin, 2007; EPPO Executive Committee, 2012). M. vimineum is currently listed as a Class C noxious weed in Alabama, an invasive, banned species in Connecticut, and a prohibited species in Massachusetts (Geosystems Research Institute, 2012). It is a regulated species in Wisconsin (IPAW, 2012) and was added to the EPPO Alert List in 2008 where it has since been transferred to the List of Invasive Alien Plants in 2012 (EPPO Executive Committee, 2012).
Taxonomic Tree
Top of page- Domain: Eukaryota
- Kingdom: Plantae
- Phylum: Spermatophyta
- Subphylum: Angiospermae
- Class: Monocotyledonae
- Order: Cyperales
- Family: Poaceae
- Genus: Microstegium
- Species: Microstegium vimineum
Notes on Taxonomy and Nomenclature
Top of pageMicrostegium is a genus of about 15 species of subtropical Asia and Africa (Sprengel, 1815; Wallich, 1821a, b; Steudel, 1855; Camus, 1922; Hitchcock and Chase, 1951; Flora of China Editorial Committee, 2012). The complex taxonomic history of M. vimineum produces 32 synonyms in five genera spread over more than 180 years. Adding to the potential for confusion are the four additional genera sometimes used synonymously: Coelarthron, Ischnochloa, Leptatherum and Nemastachys(Wunderlin and Hansen, 2008). First described in 1832 as Andropogon vimineus by the botanist Karl Bernhard von Trinius from a specimen collected by Nathaniel Wallich in Nepal, this epithet is considered a basionym (Trinius, 1832; Missouri Botanical Garden, 2012).
In 1836, the species was presented as the type Microstegium willdenowianum by the botanist and natural philosopher, Christian Gottfried Daniel Nees von Esenbeck based upon a specimen in the herbarium of C. L. Willdenow, a director of the Berlin Botanical Garden in the early nineteenth century (Nees von Esenbeck, 1836).
The genus name Microstegium is derived from Greek meaning small (in size, quantity, number or dignity) and roof. Nees, however, had failed to provide an authoritative circumscription, which was described in 1855 by Ernst Gottlieb von Steudel, the German authority on grasses (Steudel, 1855).
Adding to the nomenclature challenges was an earlier assignment of the species by Curtius (Kurt) Sprengel to the genus Pollinia, a catch-all or farrago of unrelated species (Sprengel, 1815). When the early vagaries of naming were added the sometimes indistinct morphology of the species, for example, the distinction between awned, Microstegium vimineum var. imberbe, and awnless, Microstegium vimineum var. vimineum phenotypes the result was a long list of additional species, varieties, and forms (Fairbrothers and Gray, 1972). More recentlly, Shukla (1996) refers to the awned variety as var. vimineum, and the awnless as var. willdenowianum. In 1922, the French botanist Aimée Antoinette Camus circumscribed the present accepted binomial Microstegium vimineum(Camus, 1922; Whisenhunt, 2008).
Description
Top of pageThe following description is from Flora of China Editorial Committee (2012):
M. vimineum is a straggling or decumbent annual (therophyte) plant, usually 0.6-1.0 m in height. Culms decumbent are up to 1 m long. Leaf sheaths are shorter than internodes, the upper usually enclosing cleistogamous spikelets; leaf blades are narrowly elliptic, 4–9 long and 0.2–1.5 cm wide, pubescent, often sparsely, midvein white, apex acuminate; ligule ca. 0.5 mm. Racemes 1–6, ascending, 4–6 cm; rachis internodes linear-clavate, ciliate, shorter than spikelet. Sessile spikelet 4–5.5 mm; lower glume narrowly lanceolate-oblong, back deeply grooved, puberulous-scaberulous or occasionally hispidulous, 0–4 veined between keels, veins connected by veinlets below apex, apex subtruncate; upper glume scabrid on keel, acuminate; lower floret reduced to an inconspicuous linear-lanceolate scale or absent; upper lemma lanceolate or oblong, 1–1.5 mm, acute or bidenticulate, awnless or shortly awned; awn weakly geniculate, often included within spikelet, 6–9 mm; upper palea ovate, ca. 1 mm. Anthers 3, 0.5–1.5 mm.
The plant is often identified by its thin, pale green, tapered leaf blades or by its multiple racemes that may be either terminal or arising from the leaf axils. The alternate leaves have a silvery stripe of reflective hairs down the middle of the upper leaf surface (Swearingen, 2000). The fruit or caryopsis (grain) is yellowish or olive to reddish, and ellipsoid (2.8-3.0 mm) in shape (Tu, 2000; Krings, 2010). The fertile lemma is accompanied by an ovate upper palea, clasping the opposite side of the caryopsis. Additionally an inconspicuous, linear-filiform remnant of the lower floret is often present.
In late fall, M. vimineum is readily identified as it fades to pale greenish-yellow or turns pale-purple in colour (Mehrhoff, 2000).
Being a shade tolerant plant, it is adapted for low-light conditions and uses the C4 pathway for photosynthesis (Barden, 1987; Horton and Neufeld, 1998). M. vimineum lacks the high density of minor veins found in most C4 grasses, and forms, instead, files of distinctive cells (Raghavendra, 2010).
A perennial form was reported in New Jersey, USA by Ehrenfeld (1999), but was disputed by Mehrhoff (2000) as a case of mistaken identification (Gibson et al., 2002).
Distribution
Top of pageM. vimineum is a cosmopolitan grass species native to India, Indo-China, Nepal, China, Korea, Far-east Russia, Philippines, and Japan. There are herbaria records, reports in floras and other documentation enumerating the presence of the species on every continent except Antarctica (ISSG, 2012; USDA-ARS, 2012a).
Distribution Table
Top of pageThe distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
Last updated: 12 May 2022Continent/Country/Region | Distribution | Last Reported | Origin | First Reported | Invasive | Reference | Notes |
---|---|---|---|---|---|---|---|
Africa |
|||||||
Congo, Democratic Republic of the | Present | Introduced | Prov. Kivu, Territ. Rutohuru, Nyamucagira | ||||
Congo, Republic of the | Absent, Unconfirmed presence record(s) | ||||||
Asia |
|||||||
Armenia | Present | Introduced | Original citation: Valdes et al. (2009) | ||||
Azerbaijan | Present | Introduced | Original citation: Valdes et al. (2009) | ||||
Bhutan | Present | Native | |||||
China | Present | Native | |||||
-Anhui | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Fujian | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Guangdong | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Guangxi | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Guizhou | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Hebei | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Henan | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Hubei | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Hunan | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Jiangsu | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Jiangxi | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Jilin | Present | Native | |||||
-Shaanxi | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Shandong | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Shanxi | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Sichuan | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Yunnan | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Zhejiang | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
Georgia | Present | Introduced | Original citation: Valdes et al. (2009) | ||||
India | Present | Native | NE India; Original citation: Flora of China Editorial Committee (2012) | ||||
-Himachal Pradesh | Present | Native | |||||
-Meghalaya | Present | Native | |||||
-Nagaland | Present | Native | |||||
-Sikkim | Present | Native | |||||
-Uttarakhand | Present | Native | |||||
-West Bengal | Present | Native | |||||
Iran | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
Japan | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Hokkaido | Present | Native | Original citation: EPPO Executive Committee (2012) | ||||
-Honshu | Present | Native | Original citation: EPPO Executive Committee (2012) | ||||
-Kyushu | Present | Native | Original citation: EPPO Executive Committee (2012) | ||||
-Ryukyu Islands | Present | Native | Original citation: EPPO Executive Committee (2012) | ||||
-Shikoku | Present | Native | Original citation: EPPO Executive Committee (2012) | ||||
Malaysia | Present | Native | Original citation: EPPO Executive Committee (2012) | ||||
Myanmar | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
Nepal | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
North Korea | Present | Native | |||||
Philippines | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
South Korea | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
Taiwan | Present | Native | |||||
Thailand | Present | Native | Original citation: EPPO Executive Committee (2012) | ||||
Turkey | Present | ||||||
Vietnam | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
Europe |
|||||||
Russia | Present | Native | Original citation: Flora of China Editorial Committee (2012) | ||||
-Northern Russia | Absent, Invalid presence record(s) | Primorsk; Original citation: EPPO Executive Committee (2012) | |||||
-Russian Far East | Present | Native | Primorye [s.] | ||||
-Southern Russia | Present | ||||||
North America |
|||||||
Canada | Present, Transient under eradication | ||||||
-Ontario | Present, Transient under eradication | ||||||
Costa Rica | Present, Few occurrences | Introduced | Invasive | Parque Nacional Arenal Several patches were found along one of the hiking trails leading from the road to the volcano. Latitude: 10.45, Longitude: -84.73 | |||
Puerto Rico | Present | Introduced | Invasive | ||||
United States | Present | ||||||
-Alabama | Present, Localized | Introduced | Invasive | ||||
-Arkansas | Present, Localized | Introduced | Invasive | ||||
-Connecticut | Present | Introduced | Invasive | ||||
-Delaware | Present, Widespread | Introduced | Invasive | ||||
-District of Columbia | Present, Widespread | Introduced | Invasive | ||||
-Florida | Present, Localized | Introduced | Invasive | Jackson and Liberty Counties, NW Florida | |||
-Georgia | Present, Localized | Introduced | Invasive | ||||
-Illinois | Present, Localized | Introduced | Invasive | Massac and Pope Counties, S. Illinois | |||
-Indiana | Present, Localized | Introduced | Invasive | Ohio % Switzerland Counties, SE, Indiana | |||
-Kentucky | Present, Widespread | Introduced | Invasive | ||||
-Louisiana | Present, Localized | Introduced | Invasive | ||||
-Maryland | Present, Widespread | Introduced | Invasive | ||||
-Massachusetts | Present | Introduced | Invasive | ||||
-Mississippi | Present, Localized | Introduced | Invasive | ||||
-Missouri | Present, Localized | Introduced | Invasive | ||||
-New Jersey | Present, Widespread | Introduced | Invasive | ||||
-New York | Present, Localized | Introduced | Invasive | Bronx, Duchess, and Orange Counties, S, New York | |||
-North Carolina | Present, Localized | Introduced | Invasive | Shaded banks and roadsides | |||
-Ohio | Present, Localized | Introduced | Invasive | Shaded banks and roadsides | |||
-Oklahoma | Present, Localized | Introduced | Invasive | ||||
-Pennsylvania | Present, Localized | Introduced | Invasive | Shaded banks and roadsides, Berks County, Pennsylvania | |||
-Rhode Island | Present, Localized | Introduced | Invasive | ||||
-South Carolina | Present, Localized | Introduced | Invasive | ||||
-Tennessee | Present, Widespread | Introduced | Invasive | ||||
-Texas | Present, Localized | Introduced | Invasive | Bowie County, NE Texas, | |||
-Virginia | Present, Widespread | Introduced | Invasive | ||||
-West Virginia | Present, Localized | Introduced | Invasive |
History of Introduction and Spread
Top of pageM. vimineum was introduced to North America from Asia in 1919. First collected in Tennessee, the species had spread to Atlantic coastal states from Florida to New Jersey (Tu, 2000). With the discovery of M. vimineum in Turkey and southern Caucasus, the European and Mediterranean Plant Protection Organization (EPPO) added the species to the EPPO Alert List in 2008 and transferred it to the List of Invasive Alien Plants in 2012 labelling it as an emerging invasive species (EPPO Executive Committee, 2012).The commercial use of the plant as a packing material is reported as a possible pathway of introduction in the United States (Gage et al., 2010). The Flora of the Southern and Mid-Atlantic States (Weakley, 2011) gives an indication of the establishment and spread of M. vimineum in the United States: "local" (Fernald 1950), "rarely introduced and possibly not established" (Gleason and Cronquist 1952), "sporadically naturalized" (Godfrey and Wooten 1979), "a rapidly spreading pernicious invader on moist ground, too common" (Wofford, 1989).
Introductions
Top of pageIntroduced to | Introduced from | Year | Reason | Introduced by | Established in wild through | References | Notes | |
---|---|---|---|---|---|---|---|---|
Natural reproduction | Continuous restocking | |||||||
Tennessee | Asia | 1919 | Hitchhiker (pathway cause) | Yes | Fairbrothers and Gray (1972) | |||
Turkey | 1999 | Yes | Valdes et al. (2009); Valdés et al. (2009) |
Risk of Introduction
Top of pageM. vimineum is a very serious invasive species and considered one of the most destructive introduced plants in the United States. It forms extensive and dense patches, outcompeting and eliminating nearly all other herbaceous plants, with control and eradication being difficult at best (Fryer, 2011; Weakley, 2011; ISSG, 2012). The plant establishes itself most successfully with shallow leaf litter, and reproduces best at high temperatures and high light levels. It uses water as a dispersal vector and so an increased rate of spread is associated with mesic conditions as opposed to dry conditions. Areas associated with flooding and areas with low slope or timber harvest are also beneficial for rapid spread of M. vimineum (Gage et al., 2010).
Habitat
Top of pageM. vimineum grows along mesic roadsides, railroad right-of-way ditches, utility right-of-way, logging roads, roadsides floodplain forest, forest wetland, herbaceous and shrub wetland, early and late successional forest, planted forest, forest edges and margins, woodland borders, floodplains, grassy areas, vacant lot, managed landscapes, and stream sides; in mesic upland sites, usually in moderate to dense shade. The findings of Cheplick (2010) state that "The large size and subsequent greater reproduction of plants in populations of open, sunny habitats such as along roadsides and disturbed drainage ditches or streams, provides a major source of propagules able to colonize new areas following dispersal."
M. vimineum will not grow in areas with periodic standing water, nor in full, direct sunlight (Fairbrothers and Gray, 1972; Hunt and Zaremba, 1992; Redman, 1995; Flora of China Editorial Committee, 2012).
In mountainous regions, M. vimineum is found below elevations of 4000 feet (Evans et al., 2006). Sunlight and moist soil, therefore, increase the chances of Japanese stiltgrass establishment and favour its growth. Establishment and spread are limited in shaded environments (Huebner, 2003; Fryer, 2011).
Habitat List
Top of pageCategory | Sub-Category | Habitat | Presence | Status |
---|---|---|---|---|
Terrestrial | Managed | Cultivated / agricultural land | Secondary/tolerated habitat | Harmful (pest or invasive) |
Terrestrial | Managed | Cultivated / agricultural land | Secondary/tolerated habitat | Natural |
Terrestrial | Managed | Managed forests, plantations and orchards | Secondary/tolerated habitat | Harmful (pest or invasive) |
Terrestrial | Managed | Managed forests, plantations and orchards | Secondary/tolerated habitat | Natural |
Terrestrial | Managed | Disturbed areas | Principal habitat | Harmful (pest or invasive) |
Terrestrial | Managed | Disturbed areas | Principal habitat | Natural |
Terrestrial | Managed | Rail / roadsides | Principal habitat | Harmful (pest or invasive) |
Terrestrial | Managed | Rail / roadsides | Principal habitat | Natural |
Terrestrial | Managed | Urban / peri-urban areas | Principal habitat | Harmful (pest or invasive) |
Terrestrial | Managed | Urban / peri-urban areas | Principal habitat | Natural |
Terrestrial | Natural / Semi-natural | Natural forests | Principal habitat | Harmful (pest or invasive) |
Terrestrial | Natural / Semi-natural | Natural forests | Principal habitat | Natural |
Terrestrial | Natural / Semi-natural | Natural grasslands | Principal habitat | Harmful (pest or invasive) |
Terrestrial | Natural / Semi-natural | Natural grasslands | Principal habitat | Natural |
Terrestrial | Natural / Semi-natural | Riverbanks | Principal habitat | Harmful (pest or invasive) |
Terrestrial | Natural / Semi-natural | Riverbanks | Principal habitat | Natural |
Terrestrial | Natural / Semi-natural | Wetlands | Principal habitat | Harmful (pest or invasive) |
Terrestrial | Natural / Semi-natural | Wetlands | Principal habitat | Natural |
Hosts/Species Affected
Top of pageM. vimineum impedes regeneration of native woody species and lowers overall species diversity and stem densities (Oswalt et al., 2007). One study found that it inhibited the success of small-seeded trees and reduced tree survival after one growing season by more than 20%, negatively impacting on Acer negundo (box elder), Platanus occidentalis (sycamore) and Liriodendron tulipifera (tulip poplar) (Flory and Clay, 2010).
An infestation of M. vimineum documented in 2002 in Chapman State Park , Maryland, USA showed adverse impact on Myosotis macrosperma Engelm (largeseed forget-me-not), Solidago bicolor (white goldenrod), Arisaema dracontium (green dragon) and Nemophila aphylla (smallflower baby blue eyes) (Imlay, 2012).
Biology and Ecology
Top of pageGenetics
Chromosome base number of M. vimineum is x = 10, 2n = 20 and 40; chromosomes are small (Watson and Dallwitz, 1992).
There is evidence of genetic differences among M. vimineum populations, conferring higher shade tolerance in some populations that have larger leaves. One experiment showed that two test populations significantly increased biomass production under favourable conditions, unlike a third population. In this experiment the most productive populations also responded to shade stress via greater specific leaf area (SLA) while the third population did not (Droste et al., 2009).
Reproductive Biology
M. vimineum produces abundant seed and relies entirely on its seed bank for its annual recruitment. The seeds may need a period of stratification (cool temperatures and high moisture) before they will germinate (Woods, 1989) and seeds stored in the soil may remain viable for as long as five years (Barden, 1991). The seeds may have low germination rates but many seeds are produced by each plant, resulting in an estimated 0.1– 4 million seeds per m² (Barden, 1987; Woods, 1989; Gibson et al., 2002; Judge et al., 2008; Warren et al., 2010). Each tiller of M. vimineum typically produces one terminal raceme and two to seven axillary racemes; each tiller may produce 100 to 1000 seeds per year (Cheplick, 2010).
It grows quickly in low light conditions, sometimes forming dense monocultures (monospecific stands), fruits within a single season, and is moved easily into disturbed habitats by natural means (e.g., flood scouring) and artificial means (e.g., mowing, tilling, foot traffic, and other soil disturbing activities) (Swearingen, 2000; EPPO Executive Committee, 2012). M. vimineum seeds reportedly have short-term persistence in soil ranging from one to five years (Barden, 1987; Gibson et al., 2002; Vidra et al., 2007). There are few reports or studies on M. vimineum germination though open sites and little to no litter favour germination (Fryer, 2011).
M. vimineum seed matures until fall frosts followed by plant death (Gibson et al., 2002). Seeds are also able to survive submersion in water for periods of up to 10 weeks. Barden (1991) reports that seeds can germinate while under water, but the plants do not grow. If standing water is removed, more seeds will germinate shortly afterwards.
The plant is both cleistogamous and chasmogamous (self- and cross-pollinated) (Huebner, 2003; Kuoh, 2003).
Physiology and Phenology
M. vimineum shows "extreme plasticity" in morphology, producing both flowers and stolons under a wide range of nutrient and light conditions (Fryer, 2011). Flowering and fruiting occurs in late summer (August–November); senesces in early fall (Evans et al., 2006; Flora of China Editorial Committee, 2012).
The reproductive success and establishment of the plant in woodlands "may be due to high tolerance to a range of intraspecific densities and to an ability to set seed under shady conditions even when densities are high" (Cheplick, 2010).
It is a variable species, usually with apparently awnless spikelets, where in fact a weakly developed awn is enclosed within the glumes. Sometimes the awn is exserted and obvious; rarely is it completely absent (Flora of China Editorial Committee, 2012). This species variability may have led to attempts to circumscribe varieties, subspecies, forms and novel species leading to taxonomic confusion.
Being a shade tolerant plant, it is adapted for low-light conditions and uses the C4 pathway for photosynthesis (Barden, 1987; Horton and Neufeld, 1998). M. vimineum lacks the high density of minor veins found in most C4 grasses, and forms, instead, files of distinctive cells (Raghavendra, 2010).
M. vimineum community and species responses to a future carbon dioxide enriched atmosphere may be mediated by other environmental factors and will depend on individual species responses (Belote et al., 2008). High carbon dioxide levels may negatively affect M. vimineum compared to plant species better able to assimilate extra carbon dioxide (Fryer, 2011).
Associations
M. vimineum is associated in North America with several other non-native species in the United States: garlic mustard (Alliaria petiolata), Japanese honeysuckle (Lonicera japonica), sericea lespedeza (Lespedeza cuneata), multiflora rose (Rosa multiflora), Japanese barberry (Berberis thunbergii) and Norway maple (Acer platanoides) (Gibson et al., 2002; Morrison and Mauck, 2007; Dogra et al., 2010; Fryer, 2011).
Environmental Requirements
It grows in temperate to warm continental climates. There is little available specific information about temperature ranges for the species. The coldest reported winter temperatures for a seed bank of M. vimineum are approximately -21 to -23 °C (Redman, 1995). This low temperature would equate with USDA Plant Hardiness Zone of 6b. There are no specific studies of precipitation requirements.
In the United States it is found in acidic soils (pH 5.8 to 4.8); some populations are established, however, on limestone or marble derived soils. Where it occurs, the soils typically have average levels of potassium and phosphorus but have high levels of nitrogen (Redman, 1995; Tu, 2000). It is commonly found on silty to sandy loams and on clays (red clays in the Piedmont), and prefers damp or wet soils but does not tolerate standing water (Barden, 1987; Hunt and Zaremba, 1992; Gibson et al., 2002; ISSG, 2012). Dry upland soils or “highly disturbed" soils such as gravel and dirt mounds by roadsides may also provide a suitable habitat (Swearingen, 2000; Touchette and Romanello, 2009; Fryer, 2011).
The species thrives and reproduces most successfully in North America with canopy openness, and the species occurs less frequently and grows poorly in shade (Barden, 1987; Gibson et al., 2002; Claridge and Franklin, 2003; Cole and Weltzin, 2004; Glasgow and Matlack, 2007; Marshall and Buckley, 2007; Eschtruth and Battles, 2009; Warren et al., 2010).
When provided with adequate leaf-litter, it is highly competitive, especially in low light conditions (Leicht et al., 2005; Marshall and Buckley, 2007). M. vimineum has been shown to raise soil pH and have an associated increase in N-mineralization and nitrification, as well as decreased litter thickness (Kourtev et al., 1998; Ehrenfeld et al., 2001).
Climate
Top of pageClimate | Status | Description | Remark |
---|---|---|---|
Af - Tropical rainforest climate | Tolerated | > 60mm precipitation per month | |
Am - Tropical monsoon climate | Tolerated | Tropical monsoon climate ( < 60mm precipitation driest month but > (100 - [total annual precipitation(mm}/25])) | |
As - Tropical savanna climate with dry summer | Tolerated | < 60mm precipitation driest month (in summer) and < (100 - [total annual precipitation{mm}/25]) | |
Aw - Tropical wet and dry savanna climate | Tolerated | < 60mm precipitation driest month (in winter) and < (100 - [total annual precipitation{mm}/25]) | |
Cf - Warm temperate climate, wet all year | Preferred | Warm average temp. > 10°C, Cold average temp. > 0°C, wet all year | |
Cs - Warm temperate climate with dry summer | Tolerated | Warm average temp. > 10°C, Cold average temp. > 0°C, dry summers | |
Cw - Warm temperate climate with dry winter | Tolerated | Warm temperate climate with dry winter (Warm average temp. > 10°C, Cold average temp. > 0°C, dry winters) | |
Df - Continental climate, wet all year | Tolerated | Continental climate, wet all year (Warm average temp. > 10°C, coldest month < 0°C, wet all year) | |
Dw - Continental climate with dry winter | Tolerated | Continental climate with dry winter (Warm average temp. > 10°C, coldest month < 0°C, dry winters) |
Latitude/Altitude Ranges
Top of pageLatitude North (°N) | Latitude South (°S) | Altitude Lower (m) | Altitude Upper (m) |
---|---|---|---|
41 |
Air Temperature
Top of pageParameter | Lower limit | Upper limit |
---|---|---|
Mean minimum temperature of coldest month (ºC) | -23 |
Soil Tolerances
Top of pageSoil drainage
- free
- impeded
Soil reaction
- acid
- alkaline
- neutral
Soil texture
- light
- medium
Natural enemies
Top of pageNatural enemy | Type | Life stages | Specificity | References | Biological control in | Biological control on |
---|---|---|---|---|---|---|
Balansia andropogonis | Pathogen | Adults | to genus | Attacks rice | ||
Bipolaris | Pathogen | Adults | to species | |||
Cerebella paspali | Pathogen | Adults | to genus | |||
Lethe confusa | Herbivore | Adults | to genus | |||
Lethe europa | Herbivore | Adults | to genus | |||
Melanitis phedima | Herbivore | Adults | to genus | |||
Meliola setariae | Pathogen | Adults | to genus | |||
Phakopsora incompleta | Pathogen | Adults | to genus | |||
Phyllachora ischaemi | Pathogen | Adults | to genus | |||
Phyllachora leptotheca | Pathogen | Adults | to genus | |||
Puccinia aestivalis | Pathogen | Adults | to genus | |||
Puccinia benguetensis | Pathogen | Adults | to genus | |||
Puccinia polliniae | Pathogen | Adults | to genus | |||
Puccinia polliniae-imberbis | Pathogen | Adults | to genus | |||
Puccinia polliniicola | Pathogen | Adults | to genus | |||
Semiaphis montana | Herbivore | Adults | to genus | |||
Ustilaginoidea polliniae | Pathogen | Adults | to genus | |||
Ypthima baldus | Herbivore | Adults | to genus | |||
Ypthima baldus zodina | Herbivore | Adults | to genus |
Notes on Natural Enemies
Top of pageThirteen species of fungi and eight arthropod species are reported for the genus Microstegium(Zheng et al., 2006).
Means of Movement and Dispersal
Top of pageNatural Dispersal (Non-Biotic)
Its fruits and seeds are dispersed by wind and water (Tu, 2000; Huebner, 2003; Baiser et al., 2008; Romanello, 2009; Warren et al., 2010; Fryer, 2011). The fruits of M. vimineum can float and disperse throughout an entire wetland or alluvial floodplain during high-water events (Mehrhoff, 2000).
Vector Transmission (Biotic)
Animals aid in the dispersion of the fruits and seeds.
Accidental Introduction
M. vimineum spreads along road ways facilitated by the movement of dormant seeds in road maintenance (Christen and Matlack, 2008; Rauschert et al., 2010). It has been used for basket weaving but it is neither found nor propagated in the ornamental horticulture market. Although it has not been used as forage in the USA, it is occasionally found as a forage species in its native range (Fryer, 2011).
Its propagules (seed, fruit) have previously been transported on vehicles and in hay and soil but there is a low to moderate risk of accidental introduction as a contaminant of bird seeds, soil and hay (Tu, 2000; Fryer, 2011).
Intentional Introduction
The species was used extensively as a packing material for porcelain, which may have contributed to its invasion into the United States. There is no conclusion as to the nature of the introduction of M. vimineum into the southern Caucasus region (Valdés et al., 2009; EPPO Executive Committee, 2012).
Pathway Causes
Top of pageCause | Notes | Long Distance | Local | References |
---|---|---|---|---|
Crop production | Yes | Warren et al. (2010) | ||
Disturbance | Yes | Warren et al. (2010) | ||
Flooding and other natural disasters | Moderate to high uncertainty | Yes | Mehrhoff (2000); Warren et al. (2010) | |
Forage | Moderate uncertainty | Yes | EPPO Executive Committee (2012); Warren et al. (2010) | |
Hitchhiker | Moderate uncertainty | Yes | Baiser et al. (2008); Warren et al. (2010) |
Pathway Vectors
Top of pageVector | Notes | Long Distance | Local | References |
---|---|---|---|---|
Containers and packaging - non-wood | Possible vector into US | Yes | Fairbrothers and Gray (1972) | |
Floating vegetation and debris | Yes |
Impact Summary
Top of pageCategory | Impact |
---|---|
Cultural/amenity | Positive |
Economic/livelihood | Negative |
Environment (generally) | Positive |
Human health | Negative |
Economic Impact
Top of pageThe implicit alteration of recreational and hunting preserves may be assumed to have an economic impact, though there is no specific information.
Environmental Impact
Top of pageImpact on Habitats
M. vimineum alters the structure of native plant communities and may affect ecosystems through competitive exclusion and reduction of light availability (Flory and Clay, 2009). Furthermore, it can alter the microbial compositions of soils (Kourtev et al., 2002).
Nagy et al. (2011) suggested that it may provide some benefit in areas where populations of white-tailed deer (Odocoileus virginianus) have depleted native herbaceous cover, serving as habitat for ground amphibians such as frogs and toads (anurans). As this plant is unpalatable to deer and livestock, its establishment and spread is accelerated by white-tailed deer and along with canopy disturbances interacts with herbivory to magnify the impact (Miller and Matlack, 2010; Eschtruth and Battles, 2009).
Impact on Biodiversity
The plant reduces indigenous herbaceous species productivity and diversity and decreases arthropod abundance and richness across multiple trophic levels (Simao et al., 2010). The northern pearly-eye butterfly, (Lethe anthedon) in New Jersey, on the other hand, has adapted to M. vimineum as a host plant (Swearingen, 2000; Stichte, 2011).
In North American it is a threat to eastern deciduous forests creating near monospecific stands that are highly resistant to re-colonization by native species (Oswalt et al., 2007; Flory and Clay, 2010).
Risk and Impact Factors
Top of page- Proved invasive outside its native range
- Has a broad native range
- Abundant in its native range
- Highly adaptable to different environments
- Is a habitat generalist
- Tolerates, or benefits from, cultivation, browsing pressure, mutilation, fire etc
- Pioneering in disturbed areas
- Tolerant of shade
- Highly mobile locally
- Benefits from human association (i.e. it is a human commensal)
- Fast growing
- Has high reproductive potential
- Gregarious
- Has propagules that can remain viable for more than one year
- Reproduces asexually
- Altered trophic level
- Damaged ecosystem services
- Ecosystem change/ habitat alteration
- Increases vulnerability to invasions
- Modification of fire regime
- Modification of nutrient regime
- Modification of successional patterns
- Monoculture formation
- Reduced native biodiversity
- Threat to/ loss of endangered species
- Threat to/ loss of native species
- Antagonistic (micro-organisms)
- Competition - monopolizing resources
- Competition - shading
- Competition - smothering
- Rapid growth
- Difficult to identify/detect as a commodity contaminant
Uses
Top of pageEconomic Value
M. vimineum has little to no current uses outside of the basket weaving craft (Tu, 2000).
Social Benefit
It is not intentionally planted (EPPO Executive Committee, 2012).
Environmental Services
Although there is little information available for the effects of the plant on other ecosystem services in its native range, it is highly destructive to ecosystems in non-indigenous ranges.
Similarities to Other Species/Conditions
Top of pageThe grass is similar in appearance to the North American native whitegrass Leersia virginica with which it often co-exists (Mehrhoff, 2000). It is also similar to the North American invasive Oplismenus hirtellus ssp. undulatifolius (basketgrass), as well as the native Oplismenus hirtellus subsp. setarius. It can be readily confused with another North American native, Dichanthelium clandestinum (deertongue) and may also be mistaken for Arthraxon hispidus (small carpgrass).
Prevention and Control
Top of pageDue to the variable regulations around (de)registration of pesticides, your national list of registered pesticides or relevant authority should be consulted to determine which products are legally allowed for use in your country when considering chemical control. Pesticides should always be used in a lawful manner, consistent with the product's label.
Control
Manual, mechanical, environmental/cultural, and chemical methods are all useful to varying degrees in controlling M. vimineum(Tu, 2000). Various private and public entities in the United States as well as the European Union have developed an early detection and rapid response program (integrated vegetative management, IPM) to deal with the introduction, spread, control, education (public awareness), and management of M. vimineum(EPPO Executive Committee, 2012; USDA-ARS, 2012b).
Control should be directed to propagule source reduction and eradication programs along roadways and other sunlit, disturbed areas cutting off shaded ecosystem sink populations (Pulliam, 1988; Warren et al., 2010).
Physical control methods may include hand pull or mechanical cutting of plants using a mower or "weed whacker" on vegetative shoots of small infestations (Judge et al., 2008). No biological control agent is available at this time.
Fenoxaprop-p-ethyl, has been shown to be the best chemical for controlling M. vimineum populations and maintaining native understory flora in mixed hardwood stands of eastern North America (Jacques, 2007; Judge et al., 2008; Flory, 2010; Pomp et al., 2010). However, using systemic herbicides such as glyphosate (e.g. Roundup), a herbicidal soap like pelargonic acid that kills the plants (e.g. Scythe) or herbicides specific to annual grasses may be a more effective choice. If applying glyphosate to M. vimineum in wetland sites, use the formulation labelled for wetland areas (Swearingen, 2000; Judge et al., 2008; Swearingen et al., 2010).
There is some ongoing research which suggests that invasions of M. vimineum can be controlled or eliminated using post-emergent grass specific herbicide followed by a spring application of pre-emergent herbicide (Flory, 2010).
Ecosystem Restoration
M. vimineum control and management is difficult because invaded areas are often very large and the seed can persist in the soil for several years. The plant can be removed by hand-weeding, mowing, or selective herbicides, however, the re-establishment of a resilient, self-sustaining ecosystem or community will depend upon the variables of the control method. Purdue University Extension observes that "although multiple methods may be used to kill M. vimineum, there are few practical techniques. Hand-weeding can be effective for small invasions and mowing can help to reduce seed production in flat, easily accessible areas. For large invasions in areas with trees or steep topography, selective herbicides are preferred" (Kleczewski et al., 2011). Further complicating restoration plans, for example, are the biological and physical alterations such as the differences in non-native earthworm densities in M. vimineum infested soils that have been reported (Kourtev et al., 1999). In addition, M. vimineum restoration activities are increasing available nitrogen and favoring invasive species, which in turn detracts from restoration success (DeMeester and Richter, 2009).
Gaps in Knowledge/Research Needs
Top of pageM. vimineum dispersal is an area for research as well as a potentially effective weak point for targeted management (Warren et al., 2010).
Precipitation requirements and temperature extrema are also areas of needed investigation. Additional research should target M. vimineum's impact on rare and endangered species.
Furthermore, research on indigenous and non-indigenous pathogens (both general and host specific) is scarce and invites additional study.
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Distribution References
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Links to Websites
Top of pageWebsite | URL | Comment |
---|---|---|
EPPO A2 list | http://www.eppo.org/QUARANTINE/listA2.htm | |
GISD/IASPMR: Invasive Alien Species Pathway Management Resource and DAISIE European Invasive Alien Species Gateway | https://doi.org/10.5061/dryad.m93f6 | Data source for updated system data added to species habitat list. |
Global register of Introduced and Invasive species (GRIIS) | http://griis.org/ | Data source for updated system data added to species habitat list. |
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