Global InformationRhaponticum repens information
| Russian knapweed | |
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Tribe: | Cardueae |
| Genus: | Rhaponticum |
| Species: | R. repens
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| Binomial name | |
| Rhaponticum repens (L.) Hidalgo[1]
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| Synonyms[1] | |
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Rhaponticum repens, synonyms including Acroptilon repens and Leuzea repens,[1] with the common name Russian knapweed, is a species of bushy rhizomatous perennial, up to 80 cm tall. Stems and leaves are finely arachnoid-tomentose becoming glabrous and green with age. The rosette leaves are oblanceolate, pinnately lobed to entire, 2–3 cm wide by 3–8 cm long. The lower cauline leaves are smaller, pinnately lobed; the upper leaves become much reduced, sessile, serrate to entire. The heads are numerous terminating the branches. Flowers are pink to purplish, the marginal ones not enlarged. The outer and middle involucral bracts are broad, striate, smooth with broadly rounded tips; the inner bracts are narrower with hairy tips. Pappus present with bristles 6–11 mm long. Fruit is a whitish, slightly ridged achene.
Russian knapweed is a deep-rooted long-lived perennial. Some stands have been in existence for 75 years. It forms dense colonies in cultivated fields, orchards, pastures, and roadsides.
A native to Eurasia, Russian knapweed was introduced into North America in the late 19th century. Absent only from southeastern U.S., it has become widespread in other regions, especially in the western United States.[2]
Nigropallidal encephalomalacia, also called chewing disease, a movement disorder similar to Parkinson's disease, is caused in horses ingesting Russian knapweed for prolonged periods. A sesquiterpene lactone, repin, in the plant is likely responsible for this toxicity.[3]
- ^ a b c "Rhaponticum repens (L.) Hidalgo". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-11-06.
- ^ "Acroptilon repens". Flora of North America.
- ^ Robles, M.; Wang, N.; Kim, R.; Choi, B.H. (1997). "Cytotoxic effects of repin, a principal sesquiterpene lactone of russian knapweed". Journal of Neuroscience Research. 47 (1): 90–7. doi:10.1002/(SICI)1097-4547(19970101)47:1<90::AID-JNR10>3.0.CO;2-E. PMID 8981242. S2CID 23156210.