]32 RvDBERG : Rocky Mountain flora 



"^Carduus perplexans sp. nov. 



Rather slender, about 5 dm, high; stem striate, purplish, 

 slightly tomentose ; lower leaves oblanceolate, the upper lanceo- 

 late and clasping, all merely toothed, with weak yellowish spines^ 

 glabrous and somewhat glaucous above, rather thinly white-tomen- 

 tose beneath ; heads about 3 cm. high and broad ; bracts well im- 

 bricated, usually with a glandular back, the outer shorter and 

 tipped with a short weak spine, the inner tipped with a dilated^ 

 deltoid, erose appendage ; corolla rose or red-purple. 



The appendages of the bracts would place this species nearest 



C. Centaureae^ but the bracts are broader and have a distinct 



glandular back, the corolla is pink or purplish, and the whole 



plant suggests C. aldssimus and its relatives. In fact the species 



combines characters of the Carlirwidcs and the Altissiimts groups. 



It grows at an altitude of nearly 2100 m. 



Colorado: Cimarron, \(^o\^ Baker 286, 





Carduus 



Cnicus Dnunmondii A. Gray Syn. Fl. l'^: 402, in part, i. ^., as 

 to the Colorado specimens. 



Rather stout, simple, 3-5 dm. high ; stem striate, sparingly 

 arachnoid; leaves 1.5-2 dm. long, 4-7 cm. wide, linear or oblong 

 in outline, pinnately lobed about half-way to the midrib, spar- 

 ingly arachnoid above, more or less white-tomentose beneath ; 

 lobes ovate, tipped with yellowish spines 2-5 mm. long and bor- 

 dered with smaller spines ; heads 3-4 cm, high and about as 

 broad ; bracts glabrous or nearly so, firm, more or less yellowish, 

 without dorsal glandular ridge, well imbricated in many unequal 

 series ; the outer with weak spines ; the inner unarmed and with 

 slightly dilated crisp tips ; corolla white or slightly pinkish. 



Z>; 



5 



thin flat brownish or greenish bracts, broader erose appendages, 

 red-purple corolla, and the leaves more deeply dissected, more 

 arachnoid and scarcely at all tomentose. In reality C. coloradensis 

 is more closely related to C. scariosus^ from which it differs mainly 

 In the less deeply dissected leaves and broader segments. 



Pagosa Springs, 1899, Baker 64^ (type) ; Gunni- 



Colorado : 



son, 19OT, Baker ^g2 ; Wolcott, 1902, Osterhottt 26^1. 



