Impatiens glandulifera
(Himalayan balsam)

Pictures

Picture	Title	Caption	Copyright
Title Infestation Caption Impatiens glandulifera (Himalayan balsam); roadside infestation. Germany. August 2017. Copyright ©Maja Dumat/via flickr - CC BY 2.0	Infestation	Impatiens glandulifera (Himalayan balsam); roadside infestation. Germany. August 2017.	©Maja Dumat/via flickr - CC BY 2.0
Title Flower Caption Impatiens glandulifera (Himalayan balsam); flower. France. September 2012. Copyright Public Domain - Released by Dinkum/via wikipedia - CC0	Flower	Impatiens glandulifera (Himalayan balsam); flower. France. September 2012.	Public Domain - Released by Dinkum/via wikipedia - CC0
Title Flowers Caption Impatiens glandulifera (Himalayan balsam); white flowers. Capilano Canyon, North Vancouver, British Colombia, Canada. August 2013. Copyright ©Ruth Hartnup/via flickr - CC BY 2.0	Flowers	Impatiens glandulifera (Himalayan balsam); white flowers. Capilano Canyon, North Vancouver, British Colombia, Canada. August 2013.	©Ruth Hartnup/via flickr - CC BY 2.0
Title Flowers and seed pods Caption Impatiens glandulifera (Himalayan balsam); flowers and seed pods. River Ruhr, Essen, , Germany. August 2005. Copyright ©Simplicius/via wikipedia - CC BY-SA 3.0	Flowers and seed pods	Impatiens glandulifera (Himalayan balsam); flowers and seed pods. River Ruhr, Essen, , Germany. August 2005.	©Simplicius/via wikipedia - CC BY-SA 3.0
Title Flower and seed pods Caption Impatiens glandulifera (Himalayan balsam); flower and seed pods. Note crab-spider on flower (Misumena vatia; Araneae, Thomisidae). August 2002. Copyright Public Domain - Released by Wouter Hagens/via wikipedia - CC0	Flower and seed pods	Impatiens glandulifera (Himalayan balsam); flower and seed pods. Note crab-spider on flower (Misumena vatia; Araneae, Thomisidae). August 2002.	Public Domain - Released by Wouter Hagens/via wikipedia - CC0
Title Leaves and stem Caption Impatiens glandulifera (Himalayan balsam); leaves and stem. Austria. July 2005. Copyright ©Markus Nolf (Mnolf)/via wikipedia - CC BY-SA 3.0	Leaves and stem	Impatiens glandulifera (Himalayan balsam); leaves and stem. Austria. July 2005.	©Markus Nolf (Mnolf)/via wikipedia - CC BY-SA 3.0
Title Natural habit Caption Impatiens glandulifera (Himalayan balsam); habit, in its native range (Pakistan). Plants in the native range often grow in clusters of 30-60 individuals, and are no more than 1.5m in height. Copyright ©CABI	Natural habit	Impatiens glandulifera (Himalayan balsam); habit, in its native range (Pakistan). Plants in the native range often grow in clusters of 30-60 individuals, and are no more than 1.5m in height.	©CABI
Title Invasive habit Caption Impatiens glandulifera (Himalayan balsam); invasive monoculture on the River Taw, North Devon, UK. Copyright ©CABI	Invasive habit	Impatiens glandulifera (Himalayan balsam); invasive monoculture on the River Taw, North Devon, UK.	©CABI
Title Flowers and foliage Caption Impatiens glandulifera (Himalayan balsam); flowers, leaves, and ripening seed capsules. Copyright ©CABI	Flowers and foliage	Impatiens glandulifera (Himalayan balsam); flowers, leaves, and ripening seed capsules.	©CABI
Title Flower Caption Impatiens glandulifera (Himalayan balsam); flower. Copyright ©CABI	Flower	Impatiens glandulifera (Himalayan balsam); flower.	©CABI

Identity

Preferred Scientific Name

• Impatiens glandulifera Royle

Preferred Common Name

• Himalayan balsam

Other Scientific Names

• Balsamina glandulifera (Royle) Ser.
• Balsamina macrochila (Lindl.) Ser.
• Balsamina roylei (Walp.) Ser.
• Impatiens glanduligera Lindley
• Impatiens macrochila Lindl.
• Impatiens roylei Walp.

International Common Names

• English: custodian helmet; Indian balsam; ornamental jewelweed; policeman's helmet; purple jewelweed; touch-me-not; Washington orchid
• Spanish: impaciencia
• French: balsamie de l'Himmalaya; balsamine d'Inde; balsamine géante

Local Common Names

• Denmark: kæmpe-balsamin; kjempespringfrø
• Estonia: verev lemmalts
• Finland: jättipalsami
• Germany: Drüsiges Springkraut; Indisches Springkraut
• Iceland: risalísa
• Latvia: puku sprigane
• Lithuania: bitine sprige
• Netherlands: balsemien, reuzen-
• Norway: kæmpe balsamin
• Poland: niecierpek gruczolowaty; niecierpek himalajski
• Sweden: jättebalsamin
• USA: ornamental jewelweed

EPPO code

• IPAGL (Impatiens glandulifera)

Summary of Invasiveness

I. glandulifera is a highly invasive annual species which has spread rapidly in many parts of Europe and North America after its introduction as an ornamental. The spread is likely to continue to more northerly or high montane areas as a result of global climatic change. Due to its ability to form dense stands and its conspicuous appearance it has been blamed for negative biodiversity effects. Even though these effects are less severe than often thought, further spread is undesirable and should not be facilitated by further use, in particular in natural areas. Control is advisable in certain situations, e.g. nature reserves and conservation sensitive areas, but eradication from larger parts of its invasive range is not feasible due to the need to control the plant on a catchment scale, which is often impossible due to the sheer scale of occurrence and division of land ownership.

Taxonomic Tree

• Domain: Eukaryota
•     Kingdom: Plantae
•         Phylum: Spermatophyta
•             Subphylum: Angiospermae
•                 Class: Dicotyledonae
•                     Order: Balsaminales
•                         Family: Balsaminaceae
•                             Genus: Impatiens
•                                 Species: Impatiens glandulifera

Notes on Taxonomy and Nomenclature

Before the recent advances in molecular phylogenetics, Impatiens (Balsaminaceae) was treated as a distinctly separate order, Balsaminales (Dahlgren, 1989), and more traditionally as a member of the order Geraniales under Rosidae (Cronquist, 1988; Thorne, 2000). Anderberg et al. (2002) and Geuten et al. (2004) disputed such classifications which were based mainly on morphological characteristics. As a result of their molecular phylogenetic studies, Balsaminaceae was reclassified as a family in the Ericales (an order of 26 families), sitting as a sister group to all other Ericales in the Balsaminoid Ericales. The Balsaminoid Ericales consist of the families Balsaminaceae, Marcgraviaceae, Pellicieraceae and Tetrameristaceae. Together this group comprises of approximately 1130 species. Three ‘forms’ of the species have been noted, forma albida (Hegi) B. Boivin, forma pallidaflora Weath., and forma glandulifera Vahl (Missouri Botanical Garden, 2008).

Attention should be paid to the taxonomic authority, as the true species is I. glandulifera Royle, whereas I. glandulifera Arn. is a synonym of I. taprobanica Hiern, a native of Sri Lanka (USDA-ARS, 2008).

Description

I. glandulifera is a tall glabrous annual reaching 50 to 250 cm in height. It is now Europe’s tallest annual species. Its stems can be 0.5 to 5 cm in diameter and are sometimes branched in the upper part. Roots are up to 15 cm deep, the plants often forming numerous adventitious roots from the lower nodes. The leaves are opposite, the upper ones sometimes in whorls of three, up to 25 cm long and 7 cm wide, lanceolate to obovate, petiolate and sharply serrated at the edges. The inflorescences are racemes of 2-14 flowers that are 25-40 mm long. Flowers are strongly zygomorphic, their posterior sepal forming a sac that ends in a straight spur. Their colours vary from white to pink and purple. The capsule is 3-5 cm long and up to 1.5 cm wide. It contains up to 6 (Grime et al., 1988) or 4 to 16 seeds (Beerling and Perrins, 1993), that are 4-7 mm long and 2-4 mm wide with a mean weight of 7.32 mg.

Plant Type

Distribution

I. glandulifera is native to the foothills of the Himalayas from north-west Pakistan to northern India. The native range in the western Himalayas is relatively small compared to its invasive range. According to Beerling and Perrins (1993), I. glandulifera is native from Kashmir to Garhwal between 2000 and 2500 masl, and Polunin and Stainton (1984) report the plant can grow up to 4000 masl in its native range. The plant is also recorded as native in Nepal (USDA-ARS, 2008), and possibly in Bhutan.

I. glandulifera is introduced and invasive in much of Europe, and parts of Canada, the USA and New Zealand.

Distribution Table

The 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.

History of Introduction and Spread

I. glandulifera was first introduced to the UK in 1839 as a garden ornamental. Since its introduction to the UK the plant has spread at a rate of 645 km² per year (Perrins et al., 1993 in Weber, 2003). The spread was enhanced by beekeepers and the general public who released the plant into the wild on many occasions (Rotherham, 2000). The occurrence of I. glandulifera was noticed as early as 1855 in the UK, with the plant being recorded as naturalised in the county of Middlesex. The plant is now recorded throughout the UK including offshore islands such as the Isles of Scilly, the Shetland and Orkney islands.

From the UK I. glandulifera was taken to gardens in many European countries where it is still popular. The plants range expansion in mainland Europe began some 50-100 years later than in the UK. In Finland, the plant was recorded as naturalised in 1947 and individual populations were seen to expand during the 1980s (Kurtto, 1996). In the Czech Republic the earliest record of the plant occurring in the wild was in 1896, in Northern Bohemia (Pysek and Prach, 1995). Garden escapees were found in Switzerland in 1904, from where the species migrated along the Rhine to Germany. Although the explosive mechanism disperses seeds from the plant for only up to 7 m, the invasive spread was fast. Seeds can be transported with rivers over large distances and the spread was helped by humans. The spread is likely to continue with global warming to more northerly or high montane areas (Beerling, 1993).

Risk of Introduction

Further spread of I. glandulifera is likely. As a result of seed transport with flowing water, it will predominantly lead to an increase in abundance within countries or regions. International transport may be motivated by the ongoing use and promotion of the species as a garden plant. Transport of seeds as a contaminant of soil, building material, etc. is possible, but less likely to cause new introductions (Beerling and Perrins, 1993; Hartmann et al., 1995).

I. glandulifera is regarded as an important invader in several European countries and is on the EPPO list of invasive alien plants, “as posing an important threat to plant health, the environment and biodiversity in the EPPO region. It is on the Swiss 'black list' of harmful invasives (Anon., 2002), listed as invasive in Austria (Essl and Rabitsch, 2002), and is among those invasives in Germany against which specific control measures are directed (Kowarik, 2003). I. glandulifera is also a declared noxious weed in the USA, in Connecticut, Oregon and Washington (USAD-ARS, 2008).

Habitat

In Europe, I. glandulifera is predominantly a weed of riparian systems where it can form dense monocultures along river banks (Pysek, 1995; Kowarik, 2003). I. glandulifera is also found in damp natural woodland, where it can attain is maximum known height (up to 3m), in addition the plant is found in forest plantations, forest clearings, railway embankments, waste ground, urban areas, roadside ditches and wet meadows.

In the native range, I. glandulifera is predominately a plant of high altitudes, moist, fertile valleys where it grows in clusters of 30-60 plants mixed in with surrounding native vegetation (Tanner et al., 2008). This is in stark contrast to the dense monocultures found in the invasive, introduced range.

Habitat List

Hosts/Species Affected

Biology and Ecology

Genetics

The degree of genetic heterogeneity is uncertain, though there is obvious variation in flower colour (Grime et al., 1988). The chromosome number is 2n=18 or 2n=20 (Grime et al., 1988; Beerling and Perrins, 1993).

Physiology and Phenology

Seeds germinate in early spring with a high germination rate of approximately 80% (Sebald et al., 1998). The cotyledon phase lasts until April in the UK when rapid shoot growth begins (Beerling and Perrins, 1993). The root system is augmented by adventitious roots from the lower nodes (Beerling and Perrins, 1993). The time from germination to the onset of flowering is 13 weeks in Germany, with flowering continuing for a further 12 weeks (Sebald et al., 1998). The mortality of seedlings and young plants can be high due to slug predation and physical damage from rainfall and late frosts (Prowse, 1998). Adult plants are killed by the first frost in autumn/winter months.

Reproductive Biology

The self-compatible flowers of I. glandulifera have the highest sugar nectar production per flower than any native European plant species (Chittka and Schürkens, 2001). This enables the plant to attract numerous insect pollinators, especially bees (Apis mellifera), bumble-bees (Bombus spp.) and syrphids. The species is exclusively propagated by seeds. The number of seeds produced is given as 700-800 seeds per plant and 5.7 seeds per pod by Beerling and Perrins (1993), and up to 4000 seeds per plant and 6.4 seeds per pod according to Sebald et al. (1998). A maximum of 32,000 seeds were produced per square metre in a pure stand in Germany (Koenies and Glavac, 1979). Explosive capsules expel seeds from the plant, and dissemination is also aided by flowing water, seeds transported with sediment and the fact that dry seeds are buoyant. In addition, seeds can be spread by human actions, as in the transportation with soil. Seeds require chilling to become viable. Although the species is reported as not having a persistent seed bank (Grime et al., 1988), there are indications that at least some seed can persist for 18 months (Beerling and Perrins, 1993).

Environmental Requirements

I. glandulifera has a preference for high atmospheric humidity. It grows in half-shade but also in full sunlight. In the native range the plant occurs at high altitudes between 1600 and 4300 m, but in Europe it is found at lower elevations. In the UK it has not been found above 210 m and in the eastern Alps in Austria it occurs at up to 1200 m (Drescher and Prots, 2000). In Europe, plants of all ages are frost intolerant with adults killed by the first frost in autumn and seedlings by late frosts in spring (Sebald et al., 1998). The species is also drought-intolerant and quickly wilts, and plants can survive only if the drought period is short (Beerling and Perrins, 1993). As an annual, the species is dependent on open sites for germination each spring; it is consequently favoured by disturbance. It occurs on a wide spectrum of soils from nutrient-poor to nutrient-rich and grows on mineral soils as well as on peat (Kowarik, 2003).

Associations

I. glandulifera is found in five main community types, riparian habitats, fens, mesotrophic grasslands, waste ground and woodlands. Within each habitat few associated plant species have been recorded growing within monocultures of the plant. In the UK, the main associated species are similar across the community types, and include Rubus fruticosus, Urtica dioica,Galium aparine, Cirsium arvense, and in wooded habitats the plant grows under a variety of tree species.

In southern Germany, it is most often accompanied by Urtica dioica, Aegopodium podagraria, Lamium maculatum and Galium aparine (Oberdorfer, 1983). Dense riverbank vegetation with I. glandulifera was described as Impatienti-Calystegietum, e.g., along the Odra in Poland (Dajdok et al., 1998).

Climate

Latitude/Altitude Ranges

Air Temperature

Rainfall

Rainfall Regime

Soil Tolerances

Soil drainage

• free
• impeded

Soil reaction

• acid
• alkaline
• neutral
• very acid

Soil texture

• heavy
• light
• medium

Natural enemies

Notes on Natural Enemies

I. glandulifera supports an impoverished diversity of phytophagous insects in the UK, but the extent to which these affect the ecology of the plant is not sufficiently studied (Beerling and Perrins, 1993). In the UK, only 3 arthropod species are known to feed on I. glandulifera, including two aphid species, Aphis fabae and Impatientinum balsamines, and the elephant hawk moth Deilephila elpenor (Beerling and Perrins, 1993).

Means of Movement and Dispersal

Natural Dispersal

Seeds are expelled from the plant by explosive dehiscence of the capsule and can lead to dispersal distances of 7 m. Long-distance dispersal of seeds occurs with the aid of flowing water such as along rivers. Fresh seeds are transported with sediment on the beds of rivers, and dry seeds are buoyant and can float over large distances.

Vector Transmission 

Isolated observations of seeds dispersed up to 10 m from the mother plant may indicate the possibility of seed transport by small rodents (Beerling and Perrins, 1993).

Accidental Introduction

Transport with topsoil is probable (Beerling and Perrins, 1993) but it is not clear, however, to what extent this has occurred in the introduction or spread to new areas. The transport of seed with river gravel in trains was reported in Germany (Hartmann et al., 1995), as well as contamination of building rubbish transported to waste disposal sites.

Intentional Introduction

I. glandulifera was imported as an ornamental species for its showy and scented flowers. It is being used as a garden plant in many European countries and is still sold by seed companies (Beerling and Perrins, 1993). The general public have aided the transport of this species throughout the UK, deliberately planting seeds in hedgerows and grassland (Rotherham, 2000). The flowers are very rich in pollen, and bee-keepers have dispersed seeds in order to enhance forage for honey bees (Hegi, 1912; Hartmann et al., 1995).

Pathway Causes

Pathway Vectors

Plant Trade

Economic Impact

The UK Environment Agency have estimated it would cost between £150-300 million to eradicate I. glandulifera from the UK should such a control programme be initiated. In Switzerland, Gelpke and Weber (2005) estimated it would cost between CHF 2,183,500 and CHF 13,812,696 (£923,133 to £5,839,691) to eradicate 95% of the current population of I. glandulifera in the Canton of Zürich alone. Such high costs coupled with the difficulty of implementing catchment scale control programmes due to the division of land makes controlling I. glandulifera on a national or regional level virtually impossible. Current control methods are labour intensive and difficult to implement also due to the often inaccessible habitats in which I. glandulifera grows. Control costs range from £0.50/m² for a single chemical application, or manual control by strimming up to £10/m² when habitat restoration is included (Tanner et al., 2008).

Environmental Impact

Social Impact

Although social impacts are difficult to quantify, the fact that I. glandulifera can restrict access to rivers for recreation and other amenities should be noted.

Risk and Impact Factors

• Proved invasive outside its native range
• Abundant in its native range
• Tolerates, or benefits from, cultivation, browsing pressure, mutilation, fire etc
• Pioneering in disturbed areas
• Tolerant of shade
• Highly mobile locally
• Fast growing
• Has high reproductive potential
• Gregarious
• Has propagules that can remain viable for more than one year

• Damaged ecosystem services
• Ecosystem change/ habitat alteration
• Modification of successional patterns
• Monoculture formation
• Negatively impacts forestry
• Reduced amenity values
• Reduced native biodiversity
• Threat to/ loss of endangered species
• Threat to/ loss of native species

• Competition - monopolizing resources
• Competition - shading
• Competition - smothering
• Rapid growth

• Highly likely to be transported internationally deliberately
• Difficult/costly to control

Uses

Similarities to Other Species/Conditions

Other Impatiens species are somewhat similar but differ in conspicuous features: The Asian I. parviflora is much smaller and has small pale-yellow flowers. Also, the yellow flowered European I. noli-tangere and the orange flowered American I. capensis are both smaller morphologically. The garden ornamental I. balsamina that occasionally escapes to waste ground in North America and in Europe has pubescent stems and capsules and usually single flowers.

Prevention and Control

Due 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.

Ecosystem Restoration

Tanner and Gange (2013) suggested that after the removal of I. glandulifera from an area, to prevent re-establishment and colonisation by other non-native species, native species should be reintroduced to promote arbuscular mycorrhizal fungi which have been depleted.

References

Anderberg AA; Rydin C; Källersjö M, 2002. Phylogenetic relationships in the order Ericales s.l.: analyses of molecular data from five genes from the plastid and mitochondrial genomes. American Journal of Botany, 89(4):677-687.

Anon., 2002. Schwarze Liste, Graue Liste und "Watch List". Schweizerische Kommission für die Erhaltung von Wildpflanzen.

Balogh L, 2001. Invasive alien plants threatening the natural vegetation of orsTg Landscape Protection Area (Hungary). Plant invasions: species ecology and ecosystem management, 185-197; many ref.

Beerling DJ, 1993. The impact of temperature on the northern distribution limits of the introduced species Fallopia japonica and Impatiens glandulifera in north-west Europe. Journal of Biogeography, 20(1):45-53

Beerling DJ; Perrins JM, 1993. Impatiens glandulifera Royle (Impatiens roylei Walp.). Journal of Ecology (Oxford), 81(2):367-382

Chittka L; Schnrkens S, 2001. Successful invasion of a floral market. Nature (London), 411(6838):653; 10 ref.

Czerenov SK, 1995. Vascular Plants of Russia and adjacent States (the former USSR). Cambridge, New York, USA: Cambridge University Press.

Dahlgren G, 1989. An updated angiosperm classification. Botanical Journal of the Linnean Society, 100(3):197-203.

Dajdok Z; Aniol-Kwiatkowska J; Kacki Z, 1998. Impatiens glandulifera Royle in the floodplain vegetation of the Odra river (West Poland). In: Starfinger U, Edwards K, Kowarik I, Williamson M, eds. Plant Invasions: Ecological Mechanisms and Human Responses. Leiden, The Netherlands: Backhuys, 161-168.

Dana E; Cerrillo MI; Sanz Elorza M; Sobrino E; Mota JF, 2001. Contribution to the knowledge about xenophytes in Spain: provisional check-list of alien flora in Almeria. Acta Botanica Malacitana, 26:264-276; 38 ref.

Drescher A; Prots B, 2000. Warum breitet sich das Drüsen-Springkraut (Impatiens glandulifera Royle) in den Alpen aus? Wulfenia, 7:5-26.

Eliás P, 2001. Invasion Potential of Introduced Plant Species and Possibilities of its Estimation (in Slovak, English Abstract). Zivot. Prostr., 35:83-86.

EPPO, 2002. Invasive plant species of concern in Denmark. EPPO Reporting Service, 136:12.

EPPO, 2014. PQR database. Paris, France: European and Mediterranean Plant Protection Organization. http://www.eppo.int/DATABASES/pqr/pqr.htm

Essl F; Rabitsch W, 2002. Neobiota in Österreich. Vienna, Austria: UBA.

Fremstad E; Elven R, 1997. Alien plants in Norway and dynamics in the flora: a review. Norsk geogr. Tidsskr. 51:199-218.

GB Non-native species secretariat, 2017. Himalayan balsam. London, UK: GB Non-native species secretariat, 2 pp. www.nonnativespecies.org/downloadDocument.cfm?id=33

Gelpke G; Weber E, 2005. Situation und Handlungsbedarf bezuglich invasiver neophyten im Kanton Zurich. Sektion Biosicherheit (SBS), Amt fur Abfall, wasser Energie und Luft (AWEL), Baudirektion des Kantons Zürich.

Geuten K; Smets E; Schols P; Yuan Y-M; Janssens S; Küpfer P; Pyck N, 2004. Conflicting phylogenies of Balsaminoid families and the polytomy in Ericales: combining data in a Bayesian framework. Molecular Phylogenetics and Evolution, 31:711-729.

Grime JP; Hodgson JG; Hunt R, 1988. Comparative plant ecology. A functional approach to common British species. London, UK: Unwin Hyman Ltd., 679 pp.

Guinochet M; de Vilmorin R, 1975. Flore de France. Paris, France: Centre National De La Recerche Scientifique.

Hartmann E; Schuldes H; Kübler R; Konold W, 1995. Neophyten. Biologie, Verbreitung und Kontrolle ausgewählter Arten. ecomed, Landsberg.

Hegi G, 1912. Illustrierte Flora von Mitteleuropa. Munich, Germany.

Hulme PE; Bremner ET, 2005. Assessing the impact of Impatiens glandulifera on riparian habitats: partitioning diversity components following species removal. Journal of Applied Ecology, 43:43-50.

Hymen PS, 1992. A review of the scarce and threatened Coleoptera of Great Britian. Part 1. Peterborough, UK: JNCC.

ISSG, 2017. Global Invasive Species Database (GISD). Invasive Species Specialist Group of the IUCN Species Survival Commission. http://www.issg.org/database

Koenies H; Glavac V, 1979. Über die Konkurrenzfähigkeit des Indischen Springkrauts (Impatiens glandulifera Royle) am Fuldaufer bei Kassel. Philippia, 4:47-59.

Kowarik I, 2003. Biologische Invasionen: Neophyten und Neozoen in Mitteleuropa. Stuttgart, Germany: Ulmer.

Kurtto A, 1996. Impatiens glandulifera (Balsaminaceae) as an ornamental and escape in Finland, with notes on the other Nordic countries. Acta Universitatis Upsaliensis, Symbolae Botanicae Upsalienses, 31(3):221-228; [1 pl., 2 maps]; 43 ref.

Larson C; Martinson K, 1998. Jättebalsamin Impatiens glandulifera i Sverige - invasionsart eller harmlös trädgartsflykting? Svensk Botanisk Tidskrift, 92:329-345.

Lhotska M; Kopecky K, 1966. Zur Verbreitungsbiologie und Phytozönologie von Impatiens glandulifera Royle an den Flusssystemen der Svitava, Svratka und oberen Odra. Preslia, 38:376-385.

Maule H; Andrews M; Watson C; Cherrill AJ, 2000. Distribution, biomass and effect on native species of Impatiens glandulifera in a deciduous woodland in northeast England. In: Boatman N et al., eds. Aspects of Applied Biology 58, Vegetation management in changing landscapes. Wellesbourne, UK: Association of Applied Biologists, 31-38.

Missouri Botanical Garden, 2008. Tropicos database. St Louis, USA: Missouri Botanical Garden. http://www.tropicos.org/

Nagy AM; Korpelainen H, 2015. Population genetics of Himalayan balsam (Impatiens glandulifera): comparison of native and introduced populations. Plant Ecology & Diversity, 8(3):317-321. http://www.tandfonline.com/loi/tped20

Oberdorfer E, 1983. Süddeutsche Pflanzengesellschaften. Stuttgart, Germany: Gustav Fischer Verlag.

Pacanoski Z; Saliji A, 2014. The invasive Impatiens glandulifera Royle (Himalayan balsam) in the Republic of Macedonia: first record and forecast. Bulletin OEPP/EPPO Bulletin, 44(1):87-93. http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2338

Pandza M; Franjic J; Trinajstic I; Skvorc Z; Stancic Z, 2001. The most recent state of affairs in the distribution of some neophytes in Croatia. Natura Croatica, 10(4):259-275.

Pattison Z; Rumble H; Tanner RA; Jin L; Gange AC, 2016. Positive plant-soil feedbacks of the invasive Impatiens glandulifera and their effects on above-ground microbial communities. Weed Research (Oxford), 56(3):198-207. http://onlinelibrary.wiley.com/doi/10.1111/wre.12200/abstract

Perrins J; Fitter A; Williamson M, 1993. Population biology and rates of invasion of three introduced Impatiens species in the British Isles. Journal of Biogeography, 20(1):33-44

Polunin O; Stainton A, 1984. Flowers of the Himalaya. Delhi, India; Oxford University Press, 580pp.

Polunin O; Stainton A, 1984. Flowers of the Himalayas. Oxford, UK: Oxford University Press, 580 pp.

Protopopova V; Shevera M, 1998. Expansion of alien plants in settlements of the Tisa river basin (Transcarpathia, Ukraine). Thaiszia - Journal of Botany, 8(1):33-42.

Prowse A, 1998. Patterns of early growth and mortality in Impatiens glandulifera. In: Starfinger U, Edwards K, Kowarik I, Williamson M, eds. Plant invasions: Ecological Mechanisms and Human Responses. Leiden, The Netherlands: Backhuys, 245-252.

Pysek P; Prach K, 1994. How important are rivers for supporting plant invasions. Ecology and management of invasive riverside plants., 19-26.

Pysek P; Prach K, 1995. Invasion dynamics of Impatiens glandulifera - a century of spreading reconstructed. Biological Conservation, 74(1):41-48

Rotherham ID, 2001. Himalayan balsam- the human touch. In: Exotic Invasive Species- should we be concerned? [ed. by Bradley P] Winchester, UK: IEEM, 41-50 pp.

Rothmaler W; Jäger EJ; Werner K, 2002. Gefäßpflanzen: Kritischer Band, 9. Aufl. edn. Spektrum Akad. Verlag, Heidelberg.

Schmitz G, 1998. Alien plant-herbivore systems and their importance for predatory and parasitic arthropods: the example of Impatiens parviflora DC. (Balsaminaceae) and Impatientinum asiaticum Nevsky (Hom: Aphididae). In: Starfinger U, Edwards K, Kowarik I, Williamson M, eds. Plant Invasions: Ecological Mechanisms and Human Responses. Leiden, The Netherlands: Backhuys, 335-345.

Schmitz G, 2007. New records of the monophagous herbivors on the neophyte Impatiens glandulifera: Siobla sturmi (Klug, 1817) (Hymenoptera: Tenthredinidae) and Xanthorhoe biriviata (Borkhausen, 1794) (Lepidoptera: Geometridae). (Neue Nachweise von monophagen Herbivoren am Neophyten Impatiens glandulifera: Siobla sturmi (Klug, 1817) (Hymenoptera: Tenthredinidae) und Xanthorhoe biriviata (Borkhausen, 1794) (Lepidoptera: Geometridae).) Entomologische Zeitschrift mit Insekten-Börse, 117(2):60-62. http://www.ezib.de

Sebald O; Seybold S; Philippi G; Wörz A, 1998. Die Farn- und Blütenpflanzen Baden-Württembergs. Ulmer, Stuttgart.

Tanner R; Ellison C; Shaw R; Evans H; Gange A, 2008. Losing patience with Impatiens: are natural enemies the solution? Outlooks on Pest Management, 19(2):86-91. http://www.pestoutlook.com

Tanner RA, 2008. A review on the potential for the biological control of the invasive weed Impatiens glandulifera Royle in Europe. In: Plant Invasions: Human Perception, Ecological Impacts and Management [ed. by Tokarska-Guzik B, Brock JH, Brundu G, Child LE, Daehler C, Py?ek P] Leiden, The Netherlands: Backhuys Publishers.

Tanner RA; Ellison CA; Seier MK; Kovacs GM; Kassai-Jager E; Berecky Z; Varia S; Djeddour D; Singh MC; Csiszar A; Csontos P; Kiss L; Evans HC, 2014. Puccinia komarovii var. glanduliferae var. nov.: a fungal agent for the biological control of Himalayan balsam (Impatiens glandulifera). European Journal of Plant Pathology, 141:247-266.

Tanner RA; Gange AC, 2013. The impact of two non-natibe plant species on native flora performance: potential implications for habitat restoration. Plant Ecology, 214(3):423-432.

Tanner RA; Pollard KM; Varia S; Evans HC; Ellison CA, 2015. First release of a fungal classical biocontrol agent against an invasive alien weed in Europe: biology of the rust, Puccinia komarovii var. glanduliferae. Plant Pathology, 64(5):1130-1139. http://onlinelibrary.wiley.com/doi/10.1111/ppa.12352/full

Tanner RA; Varia S; Eschen R; Wood S; Murphy ST; Gange AC, 2013. Impacts of an invasive non-native annual weed, Impatiens glandulifera, on above- and below-ground invertebrate communities in the United Kingdom. PLoS ONE, 8(6):e67271. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0067271

Thorne RF, 2000. The classification and geography of the flowering plants: dicotyledons of the class Angiospermae (subclasses Magnoliidae, Ranunculidae, Caryophyllidae, Dilleniidae, Rosidae, Asteridae, and Lamiidae). Botanical Review, 66(4):441-647.

Toney JC; Rice PM; Forcella F, 1998. Exotic plant records in the northwest United States 1950-1996: an ecological assessment. Northwest Science, 72(3):198-209; 4 pp. of ref.

USDA-ARS, 2008. Germplasm Resources Information Network (GRIN). Online Database. Beltsville, Maryland, USA: National Germplasm Resources Laboratory. https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysearch.aspx

USDA-ARS, 2017. Germplasm Resources Information Network (GRIN). Online Database. Beltsville, Maryland, USA: National Germplasm Resources Laboratory. https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysearch

USDA-NRCS, 2004. The PLANTS Database, Version 3.5. Baton Rouge, USA: National Plant Data Center. http://plants.usda.gov.

USDA-NRCS, 2008. The PLANTS Database. Baton Rouge, USA: National Plant Data Center. http://plants.usda.gov/

Varia S; Pollard K; Ellison C, 2016. Implementing a novel weed management approach for Himalayan balsam: progress on biological control in the UK. Outlooks on Pest Management, 27(5):198-203. http://www.pestoutlook.com

Webb CJ; Sykes WR; Garnock-Jones PJ, 1988. Flora of New Zealand Volume IV. Naturalised Pteridophytes, Gymnosperms and Dicotyledons. Christchurch, New Zealand: DSIR Botany Division, 1365 pp. http://floraseries.landcareresearch.co.nz/pages/Book.aspx?fileName=Flora%204.xml

Weber E, 2000. Switzerland and the invasive plant species issue. Botanica Helvetica, 110(1):11-24; 50 ref.

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

Weeda EJ; Westra R; Westra C; Westra T, 1991. Nederlandse oecologische flora. Wilde planten en hun relaties 4. Hilversum, 317 S.

Williamson MH, 1996. Biological Invasions. London, UK: Chapman & Hall. 244 pp.

Distribution References

Balogh L, 2001. Invasive alien plants threatening the natural vegetation of Orség Landscape Protection Area (Hungary). In: Plant invasions: species ecology and ecosystem management. [ed. by Brundu G, Brock J, Camarda I, Child L, Wade M]. Leiden, Netherlands: Backhuys Publishers. 185-197.

Beerling D J, Perrins J M, 1993. Impatiens glandulifera Royle (Impatiens roylei Walp.). Journal of Ecology (Oxford). 81 (2), 367-382. DOI:10.2307/2261507

CABI, Undated. Compendium record. Wallingford, UK: CABI

CABI, Undated a. CABI Compendium: Status as determined by CABI editor. Wallingford, UK: CABI

Czerenov SK, 1995. Vascular Plants of Russia and adjacent States (the former USSR)., Cambridge, New York, USA: Cambridge University Press.

Dana E, Cerrillo M I, Sanz Elorza M, Sobrino E, Mota J F, 2001. Contribution to the knowledge about xenophytes in Spain: provisional check-list of alien flora in Almería. (Contribución al conocimiento de las xenófitas en España: Catálogo provisional de la flora Alóctona de Almería.). Acta Botanica Malacitana. 264-276.

Drescher A, Prots B, 2000. (Warum breitet sich das Drüsen-Springkraut (Impatiens glandulifera Royle) in den Alpen aus?). In: Wulfenia, 7 5-26.

Eliás P, 2001. Invasion Potential of Introduced Plant Species and Possibilities of its Estimation (in Slovak, English Abstract). In: Zivot. Prostr. 35 83-86.

EPPO, 2020. EPPO Global database. In: EPPO Global database, Paris, France: EPPO.

Essl F, Rabitsch W, 2002. Neobiota in Österreich., Vienna, Austria: UBA.

Fremstad E, Elven R, 1997. Alien plants in Norway and dynamics in the flora: a review. In: Norsk geogr. Tidsskr. 51 199-218.

ISSG, 2017. Global Invasive Species Database (GISD). In: Invasive Species Specialist Group of the IUCN Species Survival Commission, http://www.issg.org/database

Kowarik I, 2003. Biologische Invasionen: Neophyten and Neozoen in Mitteleuropa. Stuttgart, Germany: Ulmer. 320 pp.

Kurtto A, 1996. Impatiens glandulifera (Balsaminaceae) as an ornamental and escape in Finland, with notes on the other Nordic countries. Acta Universitatis Upsaliensis, Symbolae Botanicae Upsalienses. 31 (3), 221-228.

Larson C, Martinson K, 1998. (Jättebalsamin Impatiens glandulifera i Sverige - invasionsart eller harmlös trädgartsflykting?). In: Svensk Botanisk Tidskrift, 92 329-345.

Lhotska M, Kopecky K, 1966. (Zur Verbreitungsbiologie und Phytozönologie von Impatiens glandulifera Royle an den Flusssystemen der Svitava, Svratka und oberen Odra). In: Preslia, 38 376-385.

Missouri Botanical Garden, 2008. Tropicos database. In: Tropicos database, St. Louis, USA: Missouri Botanical Garden. http://www.tropicos.org/

Pacanoski Z, Saliji A, 2014. The invasive Impatiens glandulifera Royle (Himalayan balsam) in the Republic of Macedonia: first record and forecast. Bulletin OEPP/EPPO Bulletin. 44 (1), 87-93. http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2338 DOI:10.1111/epp.12102

Pandža M, Franjić J, Trinajstić I, Škvorc Z, Stančić Z, 2001. The most recent state of affairs in the distribution of some neophytes in Croatia. Natura Croatica. 10 (4), 259-275.

Protopopova V, Shevera M, 1998. Expansion of alien plants in settlements of the Tisa river basin (Transcarpathia, Ukraine). Thaiszia - Journal of Botany. 8 (1), 33-42.

Prowse A, 1998. Patterns of early growth and mortality in Impatiens glandulifera. In: Plant invasions: Ecological Mechanisms and Human Responses, [ed. by Starfinger U, Edwards K, Kowarik I, Williamson M]. Leiden, The Netherlands: Backhuys. 245-252.

Pyšek P, Prach K, 1994. How important are rivers for supporting plant invasions. In: Ecology and management of invasive riverside plants. [ed. by Waal LC de, Child LE, Wade PM, Brock JH]. Chichester, UK: John Wiley & Sons Ltd. 19-26.

Pyšek P, Prach K, 1995. Invasion dynamics of Impatiens glandulifera - a century of spreading reconstructed. Biological Conservation. 74 (1), 41-48. DOI:10.1016/0006-3207(95)00013-T

Rothmaler W, Jäger EJ, Werner K, 2002. (Gefäßpflanzen: Kritischer Band, 9. Aufl. Edn)., 9 Heidelberg, Spektrum Akad. Verlag.

Sebald O, Seybold S, Philippi G, Wörz A, 1998. (Die Farn- und Blütenpflanzen Baden-Württembergs)., Stuttgart, Ulmer.

Toney J C, Rice P M, Forcella F, 1998. Exotic plant records in the northwest United States 1950-1996: an ecological assessment. Northwest Science. 72 (3), 198-209.

USA, USDA-ARS, 2008. Germplasm Resources Information Network (GRIN). Online Database. In: Germplasm Resources Information Network (GRIN). Online Database, Beltsville, USA: National Germplasm Resources Laboratory. http://www.ars-grin.gov/cgi-bin/npgs/html/tax_search.pl

USA, USDA-NRCS, 2008. The PLANTS Database. In: The PLANTS Database, Baton Rouge, USA: National Plant Data Center. http://plants.usda.gov

USDA-ARS, 2017. Germplasm Resources Information Network (GRIN). Online Database. Beltsville, Maryland, USA: National Germplasm Resources Laboratory. https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysimple.aspx

Webb CJ, Sykes WR, Garnock-Jones PJ, 1988. Flora of New Zealand. Naturalised Pteridophytes, Gymnosperms and Dicotyledons., IV Christchurch, New Zealand: DSIR Botany Division. 1365 pp. http://floraseries.landcareresearch.co.nz/pages/Book.aspx?fileName=Flora%204.xml

Weber E, 2003. Invasive plant species of the world: a reference guide to environmental weeds. [ed. by Weber E]. Wallingford, UK: CABI Publishing. viii + 548 pp.

Weeda EJ, Westra R, Westra C, Westra T, 1991. (Nederlandse oecologische flora. Wilde planten en hun relaties 4). In: Hilversum, Hilversum, 317.

Williamson M, 1996. Biological invasions. London, UK: Chapman & Hall Ltd. xii + 244 pp.

Links to Websites

Contributors

29/03/17 Updated by:

Kate Pollard, CABI, Egham, Surrey, UK 

26/05/2008 Updated by:

Rob Tanner, CABI, Egham, Surrey, UK

Distribution Maps