336 Key to the System of 



three to six within each involucre ; corolla bright-yellow, 

 its lobes rather long; anthers and stigmas often exserted; 

 pappus-bristlets yelhyvv at the summit ; fruits beset with 

 silk-like vestiture. C. pleiocephala. 



Clusters of flower-headlets always singly terminal ... 1500 



1500. Pappus-bristlets throughout white. 



Perennial, rather tall, branchless or scantily branched from 

 near the base, often beset with short either scattered or 

 interwoven hairlets ; lower leaves large, from ovate- to 

 narrow-lanceolar ; stem-leaves gradually narrower and 

 shorter, clasping at their base, all flaccid ; clusters of 

 flower-head] ets large, globular, surrounded by con- 

 spicuous, ovate, somewhat transparent, dark-margined 

 bracts ; involucres of headlets without any yellow tinge, 

 five- to eight-flowered ; corolla very turgid above the 

 middle, oftener bright-yellow than pale-yellowish, rarely 

 whitish; general receptacle almost semi-globular; pappus- 

 bristlets softly plumous-ciliolated ; fruits beset with silk- 

 like vestiture. C. Ricliea. 



Pappus-bristlets yellow at the summit ... ... 1501 



1501. Pappus-bristlets plumously ciliolate above the middle. 



Usually branchless, beset with appressed somewhat cottony 

 vestiture; leaves lax, broad-linear, the upper shortened, 

 all becoming usually glabrous above ; clusters of flower- 

 headlets from ovate to globular, comparatively small ; 

 general involucre rather inconspicuous ; general receptacle 

 ovate-cylindrical ; headlets four- to eight-flowered ; corolla 

 bright-yellow, its lobes unusually short; anthers enclosed; 

 pappus-bristlets rather rigid, connate at the base ; fruits 

 beset with silk-like vestiture. C. chrysantha. 



Pappus-bristlets plumously ciliolate throughout. 



Perennial, often tall, usually branchless, closely beset with 

 a thin interwoven whitish or greyish vestiture ; lower 

 leaves from elliptic- to liiiear-lanceolar, provided with 

 three prominent longitudinal venules ; stem-leaves shorter 

 and narrower, the upper distant ; clusters of flower- 

 headlets large, globular ; general involucre rather in- 

 conspicuous ; general receptacle convex, hollow ; headlets 

 five- to eight-flowered ; corolla bright-yellow ; anthers 

 and stigmas often enclosed ; pappus-bristlets free to their 

 base, their plumous ciliolation rather short ; fruits beset 

 with silk-like vestiture. C. globosa. 



