304 ^'EW YORK STATE MUSEUM 



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



usually wanting ;i3 A. r a d u 1 a 



Leaves lanceolate to oblong, the lower sparingly dentate 



Basal leaves with unmargined petioles 34 A. h e r v e y i 



Basal leaves with margined petioles, bracts glandular 



35 A. s p e c t a b i 1 i s 

 Li\'olucral bracts all appressed (except in A. m u 1 1 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 glabra te 36 A. 1 a t e r i f 1 o r u s 



Stem villous; leaves narrowly lanceolate, thin 



37 A. h i r su t i c a u 1 i s 

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



glabrate 38 A. v i m i n e u s 



Heads not unilaterally racemose, mostly paniculate 



Involucral bracts spatulate, mostly ciliate, somewhat spreading, 

 at least the outer ones obtuse; plants roughish-puberulent 

 39 A. m u 1 1 i f 1 o r u s 

 In\-olucral 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. s a 1 i c i f o 1 i u s 



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. t r a d e s c a n t i 



