SENECIO 293 



v. Plants clustered or tufted from root- 

 stocks, .?-2.5 ft. liigh 

 (x) Stems leafy 

 m. Rays wanting 5*. rapifolius 



n. Rays present 



(m) Heads 12-15 mm. high S. crdssulus 



(n) Heads 8-12 mm. high 

 r. Leaves glaucous ; basal leaves 



obovate to broadly spatulate S. microdontus 

 >. Leaves not glaucous, white- 

 woolly at first S. lugens 

 t. Leaves persistently white-hairy 

 or woolly 

 (r) Stems 1-2 ft. high; leaves 

 2.5-5 in. long ; heads 2- 

 4 mm. wide S. atrdtus 

 (s) Stems 4-15 in. high ; leaves 

 1-2 in. long, upper often 

 lobed ; heads 6-7 mm. 

 wide S. cdnus 

 (y) Stems with the leaves all or nearly 

 all basal 

 m. Leaves usually white-woolly, lin- 

 ear-spatulate to oblong-spatulate, 

 mostly entire S. wernerifolius 

 n. Leaves usually green, roundish, 



toothed or lobed above S. petraeus 



(2) Leaves, at least some of them, pinnatifid 

 to pinnate 



(a) Stems equally many-leaved to the top 

 x. Leaves or their segments linear or 



thread-like, white-woolly to smooth 5*. Dougldsii 

 v. Leaves pinnatifid, the divisions not lin- 

 ear but toothed or lobed S. eremophUus 



( b) Stems with the leaves much reduced up- 



wards, often to mere scales 

 x. Stems and leaves persistently white- 

 woolly, rarely becoming smooth 

 (x) Basal leaves entire S. cdnus 



(y) Basal leaves toothed to pinnatifid S.Fendleri 



