VASCULAR PLANTS. 37 



scarious margin. Keceptacle naked or villous. 

 Akenes obovate with small epigynous disk; 

 pappus 0. 



11. l> . heads small; flowers yellowish. 



56. Cotula, L. 



Superflua. Corolla of ray-flowers wanting. 

 Receptacle flat, naked, papillose. Akenes com- 

 pressed, winged, those of the ray stipitate; 

 pappus 0. 



0. flowers yellow. 



56. Soliva, Ruiz. & Pavon 



Necessaria. Superflua. Ray-flowers x , with- 

 out corolla. Style scarcely divided, persistent. 

 Receptacle flat, naked. Akenes ob-compressed, 

 winged, crowned by the style, sessile; pappus 0. 



0. flowers inconspicuous. 



Tribe VII. Senecionidae. 



Receptacle paleaceous. Pappus capillary. 



57. Nardosmia, Cass. 



Moncecia. Necessaria. Heads dimorphous. 

 6 or £ head — 8 flowers oo; $" flowers few: 

 ? or £ head — $ or $ flowers few; ? flowers 

 oo. Involucre 1 -seriate, bracteolate. Recep- 

 tacle naked. Akenes glabrous, ribbed; pappus 

 of copious, capillary bristles. 



71 . flowers pale, vernal before the leaves. 



