318 Key to the System of 



HEXiXFTERUai. 



1434. Perennial 1435 



Annual ... ... 1437 



1435. Glabrous except the fruits. 



Never tall ; stems mostly unbranched, leafy to near the 

 summit ; leaves numerous, short, linear, minutely im- 

 pressed-dotted, the uppermost passing into bracts ; 

 headlets of flowers singly terminal, almost hemispherical ; 

 outer involucral bracts broad, brownish, mostly blunt ; 

 inner bracts forming a white ray ; receptacle somewhat 

 conical ; fruits beset with silk-like vestiture. 



H. aiitliemoides. 



Partially or almost entirely beset with interwoven 

 hairlets ... ... ... 1436 



1436. Fruits beset with silk-like vestiture. 



Never tall, often branched ; leaves from narrow-lanceolar 

 to linear, soon nearly glabrous, often somewhat incurved 

 at the margin, the uppermost passing into bracts ; head- 

 lets of flowers almost hemispherical ; involucral bracts 

 all shining and white or the outer pale-yellowish, very 

 pointed, the inner forming rays ; receptacle somewhat 

 conical ; bristlets of pappus rather few. 



H. floribundum. 



Fruits glabrous. 



Never tall ; stems almost or quite branchless ; leaves flaccid, 

 from elliptic-lanceolar to narrow-linear, permanently and 

 densely beset with short hairlets, the lower elongated, 

 often recurved at the margin ; headlets of flowers singly 

 terminal, comparatively large, almost hemispherical, 

 hygroscopic ; outer involucral bracts whitish or yellow 

 or sometimes purplish or brownish, the inner forming 

 white or yellow or outside partly reddish rays ; fruits 

 pale, slightly papular-rough, somewhat attenuated at 

 the summit ; pappus short-plumous, upwards yellowish. 



H. in can u 111. 



1437. Glabrous, except portions of the involucral bracts 



and the fruits 1438 



Beset with interwoven hairlets ... ... 1439 



