Plantae > Tracheophyta > Magnoliopsida > Asterales > Asteraceae > Rhaponticum > Rhaponticum repensRhaponticum repens (Russian Knapweed)Synonyms: Acroptilon angustifolium; Acroptilon australe; Acroptilon obtusifolium; Acroptilon picris; Acroptilon repens (homotypic); Acroptilon repens australe; Acroptilon serratum; Acroptilon subdentatum; Carduus picris; Centaurea picris; Centaurea repens (homotypic); Leuzea repens; Rhaponticum repens repens; Serratula amara (heterotypic); Serratula picris Rhaponticum repens, synonym Acroptilon repens, with the common name Russian knapweed, is a bushy rhizomatous perennial, up to 8 dm 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. |
Lifespan [1] | Perennial | Structure [2] | Herb |
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Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0
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