A new Cirsium from South Dakota 



George E. Osterhout 



Cirsium coccinatum sp. nov. 



A perennial 5-8 dm. high, the stem lightly flocose at the 

 time of flowering: the leaves lanceolate in outline, 2— 2 1 dm. 

 long, pinnately lobed, the lower leaves lobed more than half 

 way to the midrib, the upper leaves completely so, green and 

 slightly tomentose on both sides, the lobes linear or narrowly 

 ovate, rather remotely spiny, and tipped with a spine 5 mm. 

 long; heads few, large, terminating the stem and short branches, 

 with purple flowers; the involucre about 4 cm. high, 4-5 cm. 

 wide, with one or more narrow leaf-like bracts at the base; the 

 bracts all upright, glabrous, imbricated in 4 or 5 successive 

 lengths, ovate lanceolate, the outer ones 10-12 mm. long, taper- 

 ing into a small weak spine, the inner ones ending in scarious, 

 twisted tips; the pappus white, of slender bristles about 4 cm. 

 long, only remotely plumose at the base. 



Cirsium coccinatum sp. nov. 



Perenne 5-8 dm. altum; folia lanceolata 20-25 cm. longa pin- 

 natiloba, suprema usque ad costam lobata, utrinque parce to- 

 mentosa, remote spinosa, ad apicem aculeo 5 mm. longo notata; 

 capitulis paucis purpureis; involucri 4 cm. alti 4-5 cm. lati, 

 bracteae glabrae 4-5-seriatim imbricatae, ovato-lanceolatae, ex- 

 teriores 10-12 mm. longae in aculeum debilem angustatae, in- 

 teriores apice contortae scariosae; pappi albi pili basi remote 

 plumosi circa 4 cm. longi. 



Collected by the writer near Hill City, Black Hills, So. Dak. 

 July 12, 1932, No. 7826. 



Windsor, Colorado 



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