334 Key to the System of 



GNEPHOSIS. 



1492. Flowers solitary within each involucre. 



Annual, rather dwarf, beset with somewhat cottony vesti- 

 ture ; leaves short, linear, extending to the inflorescence ; 

 clusters of flower-headlets capitular, surrounded by a short 

 universal involucre ; general receptacle invested with 

 rather long hairlets ; pappus tubular towards the base, 

 lobed towards the summit. G. skirrophora. 



CRXOCHXiAZKYS. 



1493. Pappus quite absent. 



Rather dwarf, extensively beset with somewhat cottony vesti- 

 ture, usually much branched ; leaves very short, linear, 

 extending to the inflorescence ; flower-headlets very small, 

 coherent by densely intricate hairlets, capitular-crowded, 

 seldom few together or solitary ; general receptacle some- 

 what elevated; corollas generally bearing some slight 

 crisp vestiture outside ; fruits glabrous. E. Behrii. 



CHTHONOCEPHALUS. 



1494. Stemless, the flower-headlets crowded and sessile 



within the tuft of flat radical leaves. 



Annual, very dwarf, beset with somewhat cottony vestiture ; 

 leaves flaccid, from lanceolar- to spatular-elliptical ; head- 

 lets of flowers very small, closely approximated into a 

 depressed mass, seldom only few together or solitary ; 

 flowers many within each involucre ; fruits minute, 

 compressed, glabrous ; pappus absent. 



C. pseudevax. 



HITALOLEPIS, 



1495. Almost or quite stemless, the flower-headlets crowded 



within a general involucre of numerous transparent 



and shining bracts. 



Quite dwarf, occasionally somewhat branched ; leaves 

 comparatively long ; headlets of flowers in dense almost 

 hemispheric clusters ; general involucral bracts in many 

 rows, pale, somewhat radiating and cottony-ciliolated ; 

 general receptacle depressed ; involucres of headlets 

 consisting of three narrow bracts ; fruits slender, some- 

 what beset with hairlets ; pappus consisting of a single 

 capillary bristlet or undeveloped. 



(Myriocephalus rhizocephalus.) H. rllizocepliala. 



