292 ASTER FAMILY 



y. Stems 6-12 in. high ; leaves toothed, 

 smooth; heads 1-6; rays 20-30 mm. 

 long S. Holmii 



b. Heads rayless, nodding ; stems .5-4 ft. high ; 



leaves lanceolate to lance-ovate S. Bigelovii 



2. Heads medium to small, 5-15 mm. long 



a. Heads distinctly nodding, many ; stems 



branched, 1-4 ft. high; leaves lanceolate, en- 

 tire, toothed or lobed, 2-6 in. long 6\ cemuus 



b. Heads not nodding 



(1) None of the leaves pinnatifid or pinnate 



(a) Stems equally many-leaved to the top 



x. Leaves linear S. spartioides 



' y. Leaves lanceolate to ovate or obovate 

 (x) Heads rayless 5-6 mm. high; leaves 

 spatulate to obovate, coarsely 

 toothed S. rapifolius 



(y) Heads with rays, 8-15 mm. high 

 m. Stems 4-12 in. high ; leaves blunt, 

 oblong to ovoid, coarsely sharp- 

 toothed or lobed, 1-2 in. long; 

 heads 10-12 mm. high S. Fremontii 



n. Stems 1-6 ft. high ; leaves lanceo- . 

 late to lance-ovate, 3-10 in. long, 

 many-toothed 

 (m) Stems 8-15 in. high; leaves 3- 

 8 on a stem; heads 1-8, 12- 

 15 mm. high 5. crdssulus 



(n) Stems 2-6 ft. high; leaves 

 many on a stem ; heads 8- 

 10 mm. high 

 r. Leaves long-lanceolate, taper- 

 ing to the base, 4-8 in. long, 

 1-3 cm. wide S.serra 



s. Leaves triangular-ovate, heart- 

 shaped or truncate at base, 

 2-6 in. long, 1-2 in. wide s. triangularis 



(b) Stems few-leaved or the upper much re- 



duced in size 

 x. Stems simple, 2-5 ft. high ; leaves fleshv, 

 usually glaucous, entire or toothed, 

 lance-oblong, 4-8 in. long 5. hydrdphilus 



