164 PENTANDRIA. DIGYNIA. 



Species. 1. C. lce-oc7 stem erect, subsarmentose, mark- 

 ed with an alternating- pubescent line; leaves smooth, 

 subcordate-ovate, acutely acuminate, sinus at the base, 

 nearly closed; margin and nerves on the under side, mi- 

 nutely pubescent; petiole very short; peduncle long; um- 

 bell interrupted, compound, umbelluli few-flowered; seg- 

 ments of the corolla, oval-oblong, obtuse; follicles smooth? 

 — Lepanthium c}hndric, retusely 5-to()thed, nearly entire. 

 Possessing all the habit o^ JlsQlepias Vhicetoxicum. i'low- 

 ers small, greenish white. 



Probably Gonolobus lavis. Mich. 1. p. 119. 



2. angusti folium. Stem twining, smooth; leaves smooth, 

 narrow, and linear, thickish; umbell upon a long peduncle; 

 segments of the corolla lanceolate. — Lepanthium cylin- 

 dric, obtusely 5-toothed. Follicles — ? Flowers small and 

 greenish. 



Ceropegin pahistris. Pursh. 1. p. 184. From Carolina 

 to Florida twining round rushes and other marsh plants. 



The genus Cynandinm appertains principally to the 

 warmer regions ot" America, a smaller number to India 

 and Africa, 2 to the south of Europe, exclusive of Vincc- 

 toxiciim so closely allied to this genus; and 1 species evei\ 

 extends to Siberia. Cynanchum is not altogether desti- 

 tute of medical economy; tlie root of C. Ipecacvanha of 

 Ceylon and the isle of France is used as an emetic in 

 doses of 24 grains, and it has recently been discovered in- 

 France that the Senna of the shops was in reality tlie» 

 leaves of a species of Cijnaiichmn disguised by an useless 

 admixture of those of the Cassia Senna. 



242. * ENSLENIA.f 



Calix small, 5-parted, persistent. Corolla 5- 

 parted, segments connivent, erect. Lepanthium 

 simple, 5-parted, petaloid, divided to its base, 

 segments truncate, flat, each terminated by 2 

 central filaments. Stamina as in Jsclepias, Fol- 

 linium, lobes subc3lindric, laterally stipitate. 

 Style 0. Stigma conic, subbilamellate. Fol- 

 licies 2, small? 



t In memory of the late Mr. Aloyslus Enslen, an assiduous 

 and practical botanist, patronised in his researches in the United 

 States by Prince Lichtenstein of Austria, and to whom Mr. 

 Pursh was frequently indebted for many of the rarer plants of 

 the Southern Stales. 



