PENTANDRIA. MOXOGYIVIA. 123 



from the summit of the tube, alternating with 

 the segments of the corolla. Stigmata 3. Cap- 

 sule S-celled, 3-valve(l, many-seeded. 



Species. 1. B. lapponica. A small cespltose herb 

 with the aspect of Sedum, and the leaves crowded around 

 the root; (as in most alpine plants), peduncles scapiform, 

 l-flo\vered. Allied to .h^e tie. 2. barbulata. (Pvxidan- 

 THERA, Midi.) A small sempervirent cespitose iierb, 

 vith erect surculi, and sessile, tt'-minal flowers; anthers 

 somewhat globular, caudate at the base, opening- trans- 

 versely. Probably distinct from the present genus. 



Excluding- the 'Pijxidanthera^ there exists but a single 

 species of Biapejisin, con»mon to the Lapponic alps, and 

 the White Hills of Ne^v Hampshire. 



190. CONVOLVULUS. L. (Bind-weed.) 



Calix 5-pai'ted. Corolla campanulate, plaited. 

 Stigmas 2. CajJSide 2 or 3-celIed, cells 2- 

 seeded. 



Lactescent and mostly twmin,^ herbs; peduncles axil- 

 lary or terminal, one or many-flowered, flowers mostly bi- 

 bracteate. A few of the tropical species are shrubby. 



Species. 1. C. tenellus. (C. tricho smithes, Mich. C. 

 Sherardi, Pursh.) 2, aquaticus. 3. Sephtm. 4. stems. 5. spi- 

 tJiamea. 6. paradoxiis. P. (3, 4, 5, and 6, are referred by 

 Pursh to Calystegia of R. Brown, a genus not suffi- 

 ciently characterised, without Mr. P. has suppressed 

 something- important in abridging it.) 7. Batatas. (Sweet 

 Potatoe. Gultivated. No where indigenous probably in 

 America; but spontaneous in India.) 8. obtusilobas. 9- sa- 

 gittifoUus. 10. pariduratns. 11. arveiisis. 12. pur pur eiis. 13. 

 macrorhizon. (Supposed to have been the Cjalapa of the 

 shops by Persoon and others, but as a medicine, proves 

 inert, and on the autliority of Dr. Baldwyn might rather 

 be used as an article of dietl) 14- tamnijolius. 



This extensive genus of near 140 species appears to be 

 almost equally divided betwixt India and the warmer re- 

 gions of America, there are also many species in Africa, 

 some in Australasia, only 3 in England, and an equally 

 small number in the Xorth of Europe, yet there are not 

 species entirely wanting in Siberia; some of those within 

 the tropics are remarkably splendid, whilst others in 

 colder countries are obscure and inconspicuous weeds 

 usually occupying neglected wastee. 



