COMPOSIT.E. 211 



KEY TO THE GENERA. 



Florets all tubular : heads not rayed . b 



^ J Inner florets tubular ; outer strap-shaped forming rays 



] (Sunflower, etc.) m 



[ All florets strap-shaped (Dandelion, etc.) s 



Florets all tubular. 



, r Florets purple, blue or white, never yellow . . . . c 

 \ Florets yellow f 



' Outer involucral bracts very broad, almost leafy : underside 

 of leaves white between green veins 



p, 213. CENTRATHERUM. 



c \ Involucral bracts narrow, in one or more series . . . d 

 Heads almost spherical, the receptacle tall and flat-topped : 

 outer florets slender : white, no pappus 



/. 220. DICHROCEPHALA. 



, f Anthers cleft at the base (tailed) : leaves alternate . , h 

 (Anthers not cleft : leaves opposite (^?/!/«/(?r/^^) . . . e 



Eupatoriece. 

 Flowers mauve : achenes with five scales, p. 219. ageratum. 

 Flowers white : achenes with scabrid hairs : young parts 



e \ sticky . /. 219. eupatorium. 



Sticky herb : anthers without the usual flap at the top : 

 achenes five-ribbed, sticky : pappus of three to five short 

 stiff" hairs /. 218. adenostemma. 



Heads globular J^ to J^ ^"^^ \ outer florets slender : 



no pappus . . . . . . p. 220, DICHROCEPHALA. 



[ Heads cylindrical, receptacle flat : achenes with pappus, g 



Involucre green i 



Involucre glistening, yellow, white or pink . pp, 227, 234, 



[ 227. ANAPHALIS, GNAPHALIUM Or HELICHRYSUM. 



Leaves entire or toothed, bracts in several rows .... 



/. 214. VERNONIA. 



Leaves pinnatifid, lyrate, or stem clasping : heads broadest 



at the base, bracts in one series only . p. 240. emilia. 



I Leaves irregularly toothed : woolly or strongly scented 



[ herbs /. 224. blumea. 



Outer involucral bracts leafy : achenes sticky : heads J^ inch. 



p. 234. CARPESIUM. 



Outer involucral bracts acute and spreading : stem winged 



but not spiny P. 226. laggera. 



Whole plant spiny, pappus feathery , . p. 246. cnicus, 



14-A 



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