PENTANDRIA. MONOGYNIA. : 125 
from the summit of the tube, alternating with | 
the segments of the corolla. Stigmata 3. Cap- 
sule 5-celled, 3-valved, many- -seeded. 
Specrzs. 1. D. lapponica. A small cespitose herb 
_ with the aspect of Sedum, and the leaves crowded around 
_ the root; (as in most alpine plants), peduncles scapiform, 
1-flowered. Allied to Aretia. 2. barbulata. (PyX1DAN~ 
THERA, Mich.) A small sempervirent cespitose herb, 
with erect surculi, and sessile, terminal flowers; anthers 
somewhat globular, caudate at the base, opening trans-— 
versely. Probably distinct from the present genus.» 
Excluding the Pyatdanthera, there exists but a single | 
species of Piiapensi, common to the Lapponic. — and = 
the White Hills of New Hampshire. : 
190. CONVOLVULUS. L. ‘(Bind-weed. 7 Hs . a= 
Calia 5-parted. Corolla campanulate, plaited. 3 
Stigmas 2. Capsule 2 or 3-celled, cells Qe 
seeded, > 
“Lactescent and mostly twining npctieeieitninctek: ‘ik: 
lary or terminal, ene or many-flowered, floweramostly. bi- 
_bracteate.. A few of the tropical species are bb 
Species. 1. C. tenellus. (C. trichosauthes, Mich. 
Sherardi, Pursh.) 2. aguaticus. 3. Sepium. 4. stans. 5. 
thamea. 6. paradoxus. P. (3, 4, 5, and 6, are referred by 
Pursh to Catystecia of R. Brown, a genus not suffix 
ciently characterised, without Mr. P. has suppressed 
something important in abridging it.) 7. Batatas. (Sweet 
Potatoe. Cultivated. No where indigenous 
America; but spontaneous in India.) 8. odtusilobus. - ry 
gittifolius. 10. panduratus. 11. arvensis. runeus. 13. 
macrorhizon. (Supposed to have been the C. jala th 
shops by Persoon and others, but as a medicine proves 
inert, and on the authority of Dr. Baldwyn might rather : 
be used as anarticle of diet!) 14. tamnifolius. > 
This extensive genus of near 140 species appears. wba 
_almost equally divided betwixt India and the warmer re- 
~ gions of America, there are also many some in ie : 
some in Australasia, only 3 in England, and all 
-. small number in the North of Europe, yet. dvenane a 
species entirely. wanting in Siberia; some of those withi 
» the tropics are remarkably ae whilst others 
colder countries are obscure and ine 
