314 Key to the Sy stern of 



IXZO&AENA. 



1420. Leaves much narrowed at the base. 



Scantily beset with cottony vestitnre; leaves from linear- to 

 elliptic-lanceolar, often recurved at the margin ; headlets 

 of flowers on elongated distantly bracteate stalks, broader 

 than long ; involucral bracts generally beset with minute 

 glandule-bearing hairlets, the inner ending in a minute 

 scarious lamina ; flowers somewhat exserted ; bristlets of 

 the pappus usually several, shorter than the corolla, 

 slightly ciliolated ; fruits almost glabrous. 



I. leptolepis. 



Leaves conspicuously clasping at the base. 



Much beset with cottony vestiture'; leaves mostly from 

 narrow- to broad -lanceolar, pointed, revolute at the 

 margin ; headlets of flowers on rather short stalks, longer 

 than broad ; flowers hardly exserted ; pappus-bristlets 

 usually many, about as long as the corollas, very slightly 

 ciliolated ; fruits almost glabrous. I. tome lit osa. 



FODOXiEFXS. 



1421. Headlets of flowers almost hemiellipsoid-cylindricaL 



Erect desert-plant ; leaves elongated, from broad- to narrow- 

 lanceolar, recurved along the margin, the upper sessile 

 and clasping at the base ; headlets of flowers usually few 

 or several together at the summit of branchlets ; in- 

 volucral bracts yellowish, wrinkled, all sessile, pointed ; 

 marginal flowers similar to all others and hardly longer ; 

 fruits somewhat papillular-rough. 



F. rutidochlaniys. 



Headlets of flowers almost hemispherical ... ... 1422 



1422. Headlets of flowers relatively large ... 1423 



Headlets of flowers relatively small ... . ... ... 1426 



1423. Involucral bracts much wrinkled. 



Perennial coast- or desert-plant, often somewhat beset with 

 cottony vestiture, hardly or scantily branched ; leaves 

 from elliptic- to linear -lanceolar or the upper quits linear; 

 headlets of flowers quite large, solitary, on elongated 



