258 ASTER FAMILY 



(a) Stems 1-headed, 2-4 in. high; leaves 



linear to spatulate ; rays white to vio- 

 let; at 10-14000 ft. 



x. Stems erect; basal leaves usually none; 

 stem leaves many, crowded, gray- 

 hairy, spiny-tipped, less than 1 cm. 

 long; heads 6-12 mm. wide; rays 10- 

 12 mm. long, violet A. alpinus 



y. Stems spreading; basal leaves many, 

 green, 3-9 cm. long; stem leaves few 

 or none ; heads 12-18 mm. wide ; rays 

 12-16 mm. long, purple A. pulchellus 



(b) Stems usually few-many-headed, .5-6 



ft. high; at 3-9000 ft. 

 x. Involucres and peduncles glandular- 

 hairy 

 (x) Stem leaves linear, or lance-linear, 

 1-5 mm. wide 

 m. Involucre 4-5 mm. high ; rays 4-5 



mm. long, violet A. pauciflorus 



n. Involucre 5-8 mm. high; rays 8-15 

 mm. long 

 (m) Rays violet, 8 mm. long A.Fendleri 



(n) Rays deep blue, 12-15 mm. 



long A. camp e sir h 



(y) Stem leaves lanceolate or oblong to 

 ovate, .5-6 cm. .wide 

 m. Leaves ovate to lance-ovate, coarse- 

 ly sharp-toothed, 2-6 cm. wide, 

 involucre 10-12 mm. high ; rays 

 violet A. conspicuus 



n. Leaves oblong to spatulate, entire 

 (m) Stems 1-2 ft. high; rays 15-30 

 r. Rays 15-25, blue-purple; in- 

 volucre 8-12 mm. high ; 

 heads few; leaves spatulate A. integrifolius 

 s. Rays 25-30, violet; involucre 

 4-6 mm. high ; heads many ; 

 leaves lance-oblong A. oblongifolius 



(n) Stems 2-6 ft. high; rays 50-70, 

 purple; involucre 8-12 mm. 

 high ; leaves lance-oblong A. novae-dngliae 



