3O4 NEW YORK STATE MUSEUM 



Leaves oblong-lanceolate, sharply serrate, rugose, the basal leaves 



usually wanting 33 A.radula 



Leaves lanceolate to oblong, the lower sparingly dentate 



Basal leaves with unmargined petioles 34 A. herveyi 



Basal leaves with margined petioles, bracts glandular 



35 A. spectabilis 

 Involucral bracts all appressed (except in A. m u 1 t i f 1 o r u s , a 

 small-headed species) ; rays mostly white, sometimes purple 

 Heads unilaterally racemose 



Stem leaves oval, oblong, or lanceolate, serrate, or chiefly so 



Stem pubescent or glabrate 36 A. 1 a t e r i f 1 o r u s 



Stem villous; leaves narrowly lanceolate, thin 



37 A. hirsuticaulis 

 Stem leaves linear-lanceolate to linear, nearly entire; stem 



glabrate 38 A. vimineus 



Heads not unilaterally racemose, mostly paniculate 



Involucral bracts spatulate, mostly ciliate, somewhat spreading, 

 at least the outer ones obtuse; plants roughish-puberulent 



39 A. multiflorus 

 Involucral bracts appressed, acute 



Heads solitary at the ends of very small-leaved branchlets 



40 A. d u m o s u s 

 Heads paniculate 



Stem leaves lanceolate, serrate or entire 

 Heads 8 to 10 lines broad 



Plants glabrous, or sparingly pubescent 



above 



Leaves firm, roughish or rough; rays 



often purplish ; involucral bracts acute 



41 A. salicifolius 



Leaves thin, smoothish; rays chiefly 



white; involucral bracts acuminate. . . 



42 A. p a n i c u 1 a t u s 

 Plant puberulent all over 



43 A. tradescanti 



