322 Key to the System of 



1450. Pappus-bristlets plumously dilated at the summit. 



Much beset with an appressed somewhat cottony vestiture ; 

 leaves short, linear-cylindrical, at last glabrous 011 the 

 outer side ; headlets of flowers comparatively large, nearly 

 hemispherical, singly terminating stems or branches ; in- 

 volucral bracts acute, ciliolated, the outer brownish, the 

 expansions of the inner rather narrow ; some of the 

 marginal flowers destitute of stamens and pappus ; fruits 

 smooth ; pappus-bristlets few. H. Baxter!. 



Pappus-bristlets minutely ciliolated or denticulated 

 up to the summit ... ... ... ... ... 1451 



1451. Finally very tall. 



Robust, occasionally remaining rather dwarf, sometimes 

 sticky, partly beset with somewhat cottony vestiture ; 

 leaves large, mostly on clasping stalks, from ovate- 

 to narrow-lanceolar, soon glabrous on the upper side ; 

 headlets of flowers large, almost hemispherical, singly 

 terminating stems or corymbously approximated branch- 

 lets ; involucral bracts narrow, pointed, shining, white 

 or tinged with rosy -red ; some of the marginal flowers 

 destitute of stamens ; fruits somewhat papillular-rough. 



H. elatum. 



Never very tall ... ... ... ... ... 1452 



1452. Glandular-rough. 



From dwarf to somewhat tall ; leaves from lanceolar- to 

 narrow-linear, revolute along the margin, the upper 

 clasping at their base ; headlets of flowers comparatively 

 large, almost hemispherical ; involucral bracts all white 

 or the outer pale -brownish ; fruits smooth. 



H. adenophorum. 



Vestiture without any glandules ... ... 1453 



1453. Stems or branches leafless towards the summit. 



Weak and dwarf ; branchless or sparingly branched, much 

 beset with a closely appressed whitish shining vestiture ; 

 leaves rather firm, mostly basal and from spatular- to 

 elliptic-lanceolar, nearly flat, soon on the upper side 

 glabrous, the upper leaves much reduced in size or 

 obliterated ; headlets of flowers rather large, almost 

 hemispherical, singly terminal ; outer involucral bracts 

 brownish or reddish ; some of the marginal flowers 

 destitute of stamens ; fruits somewhat papillular-rough. 



H. dealbatum. 



Stems or branches leafy throughout ... ... ... 1454 



