Of NORTH AMERICA. 63 



into 8 subgenera by habit, which may become 

 G. when the strange floral structure will be as- 

 certained in all. 



1. AscLEPiAS, leaves opposite, milky plants. 



2. ^ EPTixis leaves verticillate, not milky. 



3. Stethorhiza, not milky, leaves scattered, 

 type A. tuber osa with all its varieties, decum- 

 bens, splendens, imbricafa, obtiisifolia, angus- 

 ttfolia, undulata^ oppositifolia ! &c. Here 

 the sexual apparatus is borne on a pentagonal 

 pillar as in Stylandra or Fodostimn, but this 

 structure belongs also to Ascl. curassavica and 

 others. 



894. ONISTIS Raf. calix campanulate 5den- 

 tate equal, corolla campanul. subentire border 

 pentagone. Stamens 5, filaments unequal thick 

 short smooth inserted at base of corolla, an- 

 thers equal linear 21ocular opening lengthways. 

 Ovary round compressed, style long thick sub- 

 clavate, stigma capitate. Fruit a capsule ? dis- 

 coidal compressed bilocular disperme. Peren- 

 nial, diffuse leaves alt. and oppos. flowers ax- 

 illary solitary. — A singular N. G. found anony- 

 mous among the Apocynes of Florida in Coll, 

 Herb, but quite different except by habit, and a 

 N. G. of CoNvoLvuLiDEs, different from all those 

 established in my fl. tellur. 1001 to 1050 by 

 the calix and pistil, corolla akin but not plaited, 

 stamens quite as in that family. I have not the 

 ripe fruit. The name was a grecian one for 

 some Apocynum. 



895. Onistis longifolia Raf. creeping and 

 quite smooth, stem branched diffuse, leaves ses- 

 sile alterne and oppos. linear graminiform very 

 long obtuse rugose ; flowers on axillary pedun- 

 cles nodding — root white creeping terete now 

 and then swelled up, stems diffuse or prostrate 



