i PENTANDRIA, DIGYNIA. 163 
‘ 
U depressed, exactly equal with the antheri- 
dium (antheroid cells) discoid, pentangular, 
without alated lateral margins or terminal mem- 
branaceous cusps. Pollinia (masses of pollen) 
5 pair, even, transverse. Follicles 2. Seed co- 
mose, ; : é 
| Herbaceous and twinitg plants, with opposite leaves; 
flowers axillary, umbellate. Nearly allied to Cynanchum 
in some respects; and particularly to the North Ameri- 
can species, but very distinct in’ the parts of fructifica 
i} tien, having a depressed or discoid antheridium, with- : 
i out either lateral or terminal produced margins, and re- 
ceiving the pollinia transversely, but still attached as is 
{ usual in Cynanchum and Asclepias, by pairs to the upper 
anges of the stigma. ; 
- Species. 1. G. macrophyllus. 2. hirsutus. Flowers 
brown, segments of the corolla linear-oblong, follicles 
muricate, with soft spines; the whole plant pubescent; sar- 
ments and petioles hirsutely hairy; leaves cordate-oval, 
distinctly acuminate. 3. carolinensis. 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 Iam unacquainted.—In the vicinity 
of Savannah.—Dr. Baldwyn. 
4.* viridiflorus. Every where smooth; stem twining; 
lJeayes subreniform-coidate, acuminate upon longish pe- 
tioles, base auriculate; segments of the corolla linear-— 
oblong, oblique, obtuse, greenish, follicles ribbed. Han. 
On the banks of the Mississippi, near St. Louis, &c. 
v. s. in Herb, | ambert. London. 
Hitherto an American genus. ie 
241. CYNANCHUM. L. (Dog’s-bane.) 
- Calix 5-toothed, very small, and persistent. 
Corolla rotate. Lepanthium simple, cylindric, 
45 to 20-lobed,” (R. Brown,) surrounding the 
orifice of the tube. Stamina as in Asclepias. — 
| Stigmata 2. Follicles 2. Seed comose. 
‘Habit similar to Gonolodus, but many of the 
