292 ASTER FAMILY 



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

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

 long 5. Holmii 



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



leaves lanceolate to lance-ovate 6\ 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 S. cernuus 



b. Heads not nodding 



(1) None of the leaves pinnatifid or pinnate 



(a) Stems equally many-leaved to the top 



x. Leaves linear 5". spartioides 



y. Leaves lanceolate to ovate or obovate 

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

 spatulate to obovate, coarsely 

 toothed 



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

 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 1 . 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 S. 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. trianguldns 



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



duced in size 



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

 usually glaucous, entire or toothed, 

 lance-oblong, 4-8 in. long S. hydrophilus 



