23b IOWA ACADEMY OF SCIENCES. 



ochroieucus, tubes of the corolla eight and one-fourth to one-half 

 lines long, lobes three and a half lines long, strongly clavate, 

 anther tips acute, bases sagittate, filaments hairy. Achenium light 

 brown throughout, with dark longitudinal stria?. Pappus of outer 

 flowers merely barbellate, inner plumose with strongly clavate tips. 



Type No. 8093, L-iramie, Wyoming, Nelson. Laramie,. 

 Wyoming, No. 871, from similar locality, should also be 

 referred to it, although the latter number approaches C. 

 plaffpHsifi-spinotiior, except with reference to the size of 

 heads, which in C. plafff^Hsis-spitiosio/- are somewhat larger. 

 Professor Nelson's 8093 is taller and much less canescently 

 tomentose with age. The species is named in honor of 

 Prof. Aven Nelson, who has done so much for the botany 

 of Wyoming. 



Cnicus Hum, Can by. 



Cnicus HilUi, Canby Gard. and Forest. 4: 101. 1891. 

 C. odoratus, Muhl. C. odoratus, Muhl. Cat. 1 Ed.,. 



Hitchcock Cat. Anth. & Pter. of Ames. 505. 

 Cardaus Hi/lii, Canby. Porter. Bull. Torr. Bot. Club 



5: 344. 1894. 

 . Britton & Brown Illustr. Fl. N. St. H: 488.. 



/• WGSAS'dS. 



Low, sparingly branched perennial; root fusiform, tuberou.«, eight 

 to twelve inches long; one to two feet high, with purple flowers; 

 stem woolly, the branches bearing single heads; radical leaves, 



Fig. 15. Cnicus Hillii. 



variable, long; stem leaves, lower sp^iulate. oblong, with spinulose 

 margins to the point of attachment, upper sessileand clasping, usually 

 pinnatifid, lobes broad and rounded, acute or obtuse, with spinulose 

 teeth and stout bristles, leaves slightly hairy on lower surface, upper 

 smoothish; heads two one-half inches high, outer bracts of the 

 involucre ovate lanceolate with a prominent dorsal glutinous ridge,. 



