PENTANDRIA. DIgTMA. 16S 



depressed, exactly equal with the antlieri 

 dium (antlieroid cells) discoid, pentangular, 

 without alated lateral niarj^ins or terminal mem- 

 branaceous cusps. PoUinia (masses of pollen) 

 5 pail-, even, transverse. Follicles 2. Seed co- 

 mose. 



Herbaceous and twinlnt^ plants, with opposite leaves; 

 flowers axillary, umbellate. Nearly allied to Cynaiichuvi 

 in some respects; and particularly to the North Ameri- 

 *;an species, but very distinct in the parts of fructifica- 

 tion, having- a depressed or discoid antheridium, with- 

 out either lateral or terminal produced mar^^ins, and re- 

 ceiving- the pollinia transversel\ , but still attached as is 

 usual in Cijnanchum and AscJepias, by pairs to the upper 

 ang-les of the stigma. 



Species. 1. G'. macrophylbis. 2. Idrsutns. Flowers 

 brown, segments of the corolla linear-oblong, follicles 

 muricute, w ith soft spines; the whole plant pubescent; sar- 

 ments and petioles hirsutely hairy; leaves cordate-oval, 

 distinctly acuminate. 3. caroliiiensis. Stem twining and 

 with the petioles hirsutely hairy, the whole plant pubescent; 

 leaves ovate-cordate, acute, somewhat acuminate; seg- 

 ments of the corolla ovate-obtuse; flowers yellowish, um- 

 bellate. — The leaves are not hirsute but covered on both 

 sides with a minute pubescence. Pollinia transverse It 

 is nearly allied to the preceding, but very distinct in the 

 flower; with the fruit lam unacquainted. — In the vicinity 

 of Savannah. — JJr. Bahhvyn. 



4.* viridjiorus. Every where smooth; stem twining; 

 feaves subreniform-cordate, acuminate upon longish pe- 

 tioles, ba^e auriculate; segments of the corolla linear- 

 oblong, oblique, obtuse, greenish, follicles ribbed Had. 

 On the banks of the Mississippi, near St. Louis, £tc. 

 r. .?. in Herb. Lambert. London. 



Hitherto an American genus. ^* 



241. CYNANCHUM. L. (Dog's-bane.) 



Calix 5-toothed, very small; and persistent. 



Corolla rotate. Lepanthiwn simple, cylindric, 



« 5 to 20-lobed," (R. Brown,) surrounding the 



orifice of the tube. Stamina as in Asclepias. 



Stigmata 2. Follicles 2. Seed comose. 



Habit similar to GonolobuSj but many of the species 

 are sbiubby. 



