296 



CONVOLVULACEjE. XVIII. POLYMERIA. XIX. CALYSTEGIA. 



Large-calyxed Polymeria. PI. creeping. ? 



2 P. PUSILLA (R. Br. 1. c.) sepals equal ; leaves cordate, 

 somewhat emarginate ; peduncles 1-flowered; seeds rather vil- 

 lous. H.. S. Native of New Holland, within the tropic. 



Var. a ; leaves ovate, obtuse. 

 Far. j3 ; leaves sub-hastate, linear. 

 Small Polymeria. PI. creeping. 



3 P. QUADRIVA'LVIS (R. Br. 1. c.) sepals equal ; leaves cor- 

 date, obtuse, glabrous above, but downy on the veins beneath ; 

 peduncles 1-flowered ; capsule 4-valved, 2-seeded ; seeds 

 tomentose. If. . S. Native of New Holland, within the tropic. 



.Four-ua/iW-fruited Polymeria. PI. creeping. 



4 P. LANA'TA (R. Br. 1. c.) sepals equal ; leaves cordate, ob- 

 tuse, mucronulate, woolly on both surfaces, as well as the seeds ; 

 peduncles 1-flowered. 7/ . S. Native of New Holland, within 

 the tropic. 



Woolly Polymeria. PI. creeping ?. 



5 P. AMBIGUA (R. Br. 1. c.) sepals equal ; leaves cordate- 

 oblong, obtuse, mucronulate, smoothish above, and woolly be- 

 neath ; peduncles 1-3-flowered. Tj.. S. Native of New Hol- 

 land, within the tropic. 



Ambiguous Polymeria. PI. creeping. 



Cult. The species of Polymeria will grow in a mixture of 

 sand and loam ; and they are easily increased by separating the 

 creeping, rooted shoots, or by cuttings. 



XIX. CALYSTE'GIA (from <caAi>, calyx; and wyw, stego, 

 to cover ; in reference to 2 large opposite bracteas which inclose 

 the flower.) R. Br. prod. p. 483. Choisy, in mem. soc. phys. 

 gen. 6. p. 485. Convolvulus species of Lin. and other authors. 



LIN. SYST. Penldndria, Monogynia. Calyx 5-parted, inclosed 

 within 2 foliaceous bracteas. Corolla campanulate, 5-plicate. 

 Style one ; stigma 2-lobed : lobes terete or globose. Ovarium 

 2-celled ; cells 2-ovulate. Capsule 1-celled from the shortness 

 of the dissepiment. Lactescent, glabrous, twining, or prostrate 

 herbs. Peduncles solitary, 1-flowered. 



1 C. SE'PIUM (R. Br. prod. p. 483.) leaves sagittate or cor- 

 date, very acute : hind lobes obtuse or truncate, entire ; brac- 

 teas cordate, keeled, acute, longer than the calyx, but one half 

 shorter than the corolla ; peduncles tetragonal, exceeding the 

 petioles; sepals acute. Tf.. *"\ H. Native throughout Europe, 

 in hedges ; also of Caucasus, and on the banks of the river St. 

 Laurence ; New South Wales, south coast of New Holland, and 

 Van Diernen's Land. Very common in Britain. Conv. sepium, 

 Lin. spec. 1. p. 218. Willd. spec. 1. p. 844. (Ed. fl. dan. t. 458. 

 Smith, engl. hot. t. 313. Curt. fl. lond. 1. t. 13. Stev. and 

 Church, med. bot. 1. p. 1 1 . t. 2. Plenck. off. t. 91. Mayer- 

 hoffer, fl. mon. t. 27. Conv. Tuguriorum, Forst. prod. no. 74, 

 is hardly distinct. Flowers white, sometimes tinged with red. 

 Roots creeping much, and difficult to extirpate ; and, like the 

 roots of most perennial convolvulaceous plants, are purgative in 

 a greater or less degree. A pill composed of one ounce and a 

 half of the extract of this root, two drachms of aloes, and one 

 drachm of ginger, acts with certainty and ease in doses of 10 

 grains, and might be substituted in most cases for the compound 

 extract of colocynth, where economy is required. Haller 

 affirms, that the expressed juice, if taken in the quantity of 20 or 

 30 grains, possesses the virtues of scammony: hence it is some- 

 times called German scammony, and is recommended by Dr. 

 Mason Good, as a hydrogogue purgative in dropsies. 



Far. /3, incarnata ; corollas pale red ; white, with a red 

 border, or beautiful crimson, as figured in bot. mag. no. 732. 

 ?/ . *"\ H. Native of North America, from Canada to Carolina, 

 in hedges, and among bushes, sometimes trailing on the ground. 



Conv. repens, Michx. fl. bor. amer. 1. p. 137. Lin. spec. ed. 

 1st. p. 158. ed. 2d. p. 225. Gron. virg. p. 28. 



Far. y, marilima (Gouan. monsp. p. 27.) leaves narrower, 

 more fleshy, nearly lanceolate. 



Hedge Calystegia, or Common Bind-weed. Fl. Ju. Sept. 

 Britain. PI. tw. 



2 C. SUBVOLU'BILIS ; stems erect at bottom, smoothish, but 

 twining at top, and rather villous ; lower leaves mucronate, cor- 

 dately sagittate : with the hind lobes roundish ; superior leaves 

 acuminated, hastate ; peduncles erect, longer than the leaves ; 

 bracteas broad-cordate, acute, rather hairy, one half longer than 

 the calyx ; sepals ovate, acute. y..^. H. Native of Dahuria, 

 in stony, mountainous places. Conv. subvolubilis, Bunge, in 

 Led. fl. ross. alt. ill. t. 205. fl. alt. 1. p. 222. Root creeping. 

 Corolla pale red, larger than that of C. sepium. 



Somewhat-twining Calystegia. PI. twining. 



3 C. PELLITA; twining, villous; leaves ovate-oblong, mu- 

 cronate, somewhat cordate at the base ; peduncles about equal in 

 length to the leaves ; bracteas cordate, acute, villous, one half 

 longer than the calyx ; sepals elliptic, acuminated, ciliated, vil- 

 lous. 1{. / "\ H. Native of Siberia, near Irkutsk. Conv. pel- 

 litus, Led. fl. ross. alt. ill. t. 206. fl. alt. 1. p. 223. Hind lobes 

 of leaves drawn out, rounded, and mucronate. 



Clothed Calystegia. PI. twining. 



4 C. SYLVE'STRIS (Rcem. et Schultes, syst. 4. p. 183.) leaves 

 cordate-sagittate : hind lobes angularly truncate, approximate ; 

 peduncles nearly terete ; bracteas ovate, obtuse or emarginate, 

 concave, swollen, keeled, longer than the calyx ; sepals obtuse. 

 Ij..^. H. Native of Hungary, about Mehadia, near the hot 

 baths of Hercules. Conv. sylvaticus, Willd. enum. 1. p. 202. 

 Waldst. et Kit. pi. rar. hung. 3. p. 290. t. 261. Schultes, oest. 

 fl. 2. ed. 1. p. 381. Very nearly allied to C. sepium. Co- 

 rollas large, white. 



Wild Calystegia. Fl. June, Sept. Clt. 1815. PI. tw. 



5 C. LUCA'NA; leaves sagittate: hind lobes entire; pedun- 

 cles tetragonal, longer than the leaves ; braeteas ovate-oblong, 

 acuminated, clasping the calyx ; corolla with a long cylindrical 

 tube. I/ . w . H. Native of Lucania, in woods. Convolvulus 

 Lucanus, Tenore, fl. neap. prod, append. 5. 1826. Tube of 

 corolla 2-3 inches long ; limb white, red below. This species 

 differs from C. sepium in the tube of the corolla being cylin- 

 drical, and twice as long, in the bracteas being concave, and 

 clasping the calyx, not flat. 



Lucania Calystegia. PI. tw. 



6 C. DAHU'IUCA (Sims, bot. mag. 2609, under Convolvulus.) 

 stems tomentose ; leaves glabrous, oblong-cordate, having the 

 margins and nerves on the under side tomentose ; peduncles 

 tetragonal, tomentose; bracteas broad-ovate, acute, longer than 

 the calyx ; sepals lanceolate, acute, the 2 outer ones broadest. 

 It.^.H. Native of Dahuria. Corolla of a rosy purple colour. 

 Roots creeping. 



Dahurian Calystegia. Fl. July, Aug. Clt. 1826. PI. tw. 



7 C. CATESBYA'NA (Pursh, fl. amer. sept. 2. p. 729.) tomen- 

 tose ; leaves oblong-sagittate, acuminated ; peduncles 1-flowered, 

 shorter than the leaves ; bracteas oval, obtuse, longer than the 

 calyx, l/.^.H. Native of Carolina. Conv. Catesbae'i, Spreng. 

 syst. 1. p. 603. Flowers large, purple. 



Catesby's Calystegia. PI. tw. 



8 C. PARADOXA (Pursh, fl. amer. sept. 2. p. 729.) trailing, 

 tomentose ; leaves oblong, cordately sagittate, acute ; peduncles 

 elongated, 1-flowered, longer than the leaves ; bracteas linear, 

 remote from the flower ; calyxes naked, glabrous, acuminated. 

 If. H. Native of Virginia or Carolina. Conv. paradoxus, 

 Spreng. syst. 1. p. 608. Flowers large, white. 



Paradoxical Calystegia. PI. trailing. 



