320 Key to the System of 



brownish-yellow, transparent, inner forming a white 

 ray ; fruits beset with silk-like vestiture, those of some 

 of the central flowers imperfect. 



H. corymbiflorum. 



Headlets of flowers quite small. 



Quite dwarf, slightly beset with cottony hairlets ; leaves 

 from filiform- to narrow-linear, the lower often opposite, 

 the upper reaching the inflorescence ; head lets of flowers 

 almost cylindrical; outer involucral bracts brownish, 

 shining, transparent, ' inner forming a minute white 

 ray ; flowers few within each involucre ; fruits beset 

 with silk -like vestiture, those of the central flowers 

 imperfect. H. pygmaeum. 



1443. Involucral bracts rigid. 



Quite dwarf, somewhat beset with mostly scattered hair- 

 lets ; leaves from linear- to narrow-lanceolar, flat ; head- 

 lets of flowers scattered, sessile, semiovate, axillary and 

 terminal ; outer involucral bracts pale, shining, acute, 

 conspicuously ciliolated, inner semicoherent, particularly 

 rigid ; receptacle elevated ; fruits slightly rough ; pappus 

 of the marginal flowers absent, of the others consisting 

 of one to four flattish ciliolated bristlets. 



H. dimorpholepis. 



Involucral bracts tender-membranous .:. ... 1444 



1444. Flowers from two to five within each involucre. 



Never tall, closely beset with somewhat cottony vestiture ; 

 lower leaves from ovate- to spatular-cuneate, upper from 

 elliptic- to narrow-lanceolar and clasping ; headlets of 

 flowers quite small,, hemiellipsoid-cylindrical, densely 

 crowded at the summit of branches ; involucral bracts 

 from brownish- to pale-yellowish, transparent, none 

 expanding ; fruits almost glabrous, but quite concealed 

 within intricate hairlets from the nearest bracts ; bristlets 

 of pappus capillary, extremely delicate. 



II, moschatum. 



Flowers many within each involucre. 



Very minute, somewhat branched, slightly beset with hair- 

 lets ; leaves from filiform- to narrow-linear ; headlets of 

 flowers almost semiovate, sessile ; involucral bracts from 

 reddish-brown or greenish to yellowish, shining, trans- 

 parent, none expanding ; fruits glabrous. 



H-. exiguuni. 



