SENECIO 293 



y. Plants clustered or tufted from root- 

 stocks, .5-2.5 ft. high 

 (x) Stems leafy 



m. Rays wanting S. 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 

 s. 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 5*. 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 

 y. Leaves pinnatifid, the divisions not lin- 

 ear but toothed or lobed S. eremophilus 



(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 5". cdnus 



(y) Basal leaves toothed to pinnatifid S. Fendleri 



