MOXOPETALOUS EXOGENOUS PLAXTii. o33 



tt Perennial; rays conspicuous. 



E. BELLIDIFOLIUM, Muhl. Haiiy or villous; steDi 

 simple ; lowest leaves spatulate or obovate, toothed above 

 the middle, the upper oblong, sessile and entire; heads 

 large, solitary or corymbose; rays broadly linear, bluish 

 purple. Sleni 1° high, stoloniferous. 



E. VERNUM, Torr. and Gray. Smooth or nearly so ; ste}n 

 simple, scape-like; radical leaves clustered, thick, spatu- 

 late or obovate, entire or slightly toothed, the others small 

 and remote; heads corymbed ; rays (about 30) white. 

 (E. nudicaule, Michx.) Rhizoma thick; stem l°-2° high. 



DIPLOPAPPUS, Cass. 



Heads many-flowered; rays 8-12, pistillate; scales of 

 the involucre imbricated, without herbaceous tips ; recep- 

 tacle flat, alveolate; pappus of capillary bristles in two 

 rows, the outer row much shorter. — Perennial erect herls ; 

 leaves alternate ; heads single or corymbose ; rays white or 

 purple. 



* Rays purple. 



D. LiNARiiFOLius, Hook. Stem rigid, simple, closely 

 pubescent; leaves numerous, linear, spreading, the mar- 

 gins very rough ; heads solitary or somewhat racemose ; 

 scales of the involucre imbricated in several rows, linear, 

 appressed ; achenia silky. Stem 1° high ; leaves 1' long. 



** Hays white. 



D. coRN-iFOLius, Darl. Stem pubescent ; leaves ellipti .al, 

 tapering at each end, hairy on the margins and veins be- 

 neath ; heads few, on slender spreading peduncles ; achenia 

 smooth. Stem l°-2° high ; leaves 2'-4' long. 



D. AMYGDALTNUS, Torr. and Gray. Stem rough ish and 

 corymbose above ; leaves oval or oblong, acute at each end, 



