ERIGERON— ERIOPHYLLUM 271 



r. Involucral bracts spreading and 



reflexed E. salsuginosus 



s. Involucral bracts erect and ap- 

 pressed 

 (r) Upper stem leaves greatly 

 reduced, mostly few and 

 bract-like, hairy to near- 

 ly smooth E. as per 

 (s) Stem leaves not bract-like, 

 usually many and gradu- 

 ally reduced E. macrdnthus 

 {2) Annual or biennial, without rootstocks, 

 runners, etc. 



(a) Stem leaves broad, clasping by a heart- 



shaped base; rays usually pink E. philadelphicus 



( b ) Stem leaves not broad and clasping 



x. Stems much branched at the base, 4-12 



in. high; rays usually rose or purplish E. diver gens 

 y. Stems simple at base, branched above, 



1-2 ft. high; rays white E. ramosus 



b. Bracts of the involucre in 3 or 4 rows, the 



outer usually shorter ; stems tufted from a 



woody base with long woody roots ; leaves 



spatulate to linear, more or less silvery-hairy 



(1) Heads 12-15 mm. high; involucres 2-2.5 



cm. wide; rays 12-15 mm. long; achenes 



hairy E. argentdtus 



(2) Heads 6-10 mm. high; involucres 1-1.5 cm. 



wide; rays 6-15 cm. long; achenes 



smooth or hairy E. cdnus 



Eriophyllum Lagasca 1818 

 (Gr. erion, wool, phyllon, leaf, from the woolly plant) 



Heads with yellow ray-flowers, the disk-flowers yellow, perfect, achenes 

 narrow club-shaped to wedge-oblong, usually 4-angled, pappus of scales ; 

 receptacle flat to convex, involucre hemispheric, of separate or imited bracts 

 in 1-2 series; heads solitary or scattered; leaves alternate or opposite; en- 

 tire or lobed , annual or perennial. 



1. Stems 1-4 in. high; heads sessile or nearly so E. Walldcei 



2. Stems 4-12 in. high; heads stalked E.integrifoliitm 



