4,66 CONVOLVULACEJi:. 



summit: limb slightly 2-lipped, with subequal segments. Stamens didynamous. Fruit 

 " drupaceous, indehiscent, 2-beaked : fertile cells few-1 -seeded." — Viscons-pubescent herbs ; 

 leaves opposite, superior alternate ; flowers large, pecbincled, solitary in the axils, or the 

 superior racemose. 



35. C. annua, £. Leaves cordate-roundish, palmatifid ; lobes dentate-sinuate ; corolla 

 white : tube 5-6 times as long as the calyx, aud as the diameter of the limb. — Jacq. Amer. 

 Plot. t. 166. — CoroEa-tube 6"-7" long. — Hab. Trinidad I, Lockh., in savannahs; [Haiti; 

 New Mexico I to Venezuela I]. 



CXVII. CONVOLVULACE^. 



Stamens 5 (-4), inserted into the sympetalous, mostly plaited corolla. Ovary 2-4(-mauy)- 

 celled, rarely paracarpous or apocarpous : ovules of each caxpel 3-1, erect. Embryo mostly 

 curved, with the cotyledons corrugate, rarely undivided : albumen thin or none. — Stem often 

 twining, usually Herbaceous ; leaves alternate, mostly exstipulate ; flowers cymose or single, 

 mostly axillary ; sepals usually distinct ; corolla-limb often repand-entire. 



The milky sap is drastic : drugs, similar to the Jalap of Mexico, are obtained from 

 several Ipomeea, viz. /. tuiefosa, cathartica, maerorrhiza, and acetosifolia. The tubers of 

 Ipomoete Batatas are the sweet potatoes, cultivated in all tropical countries ; the tubercles 

 of /. repanda also are eatable, while the large tubers of others (except I.fastigiata) are 

 drastic. 



1. AEGYREIA, Lour. 



Calyx 5-leaved. Corolla campanulate-infundibular. Ovary 4-celled: cells 1-ovulate; 

 stigma 3-lobed-capitate. Pericarp indehiscent. — Climbers; flowers large; ovary in our 

 species supported iy an annular disk. 



1. A. tiliifolia, Wight. Pulerulous ; leaves cordate-roundish, entire; peduncles 1- 

 few-jlowered, exceeded by the petiole; sepals leathery, rounded, one-fifth as long as the 

 corolla ; corolla abruptly tapering at the base ; seeds minutely puberulous. — Wight Ic. 

 t. 1358. — Convolvulus, Descr. Rivea, Cliois. — Corolla rosy, 3" long. — Had. Jamaica!, 

 Pd., along the seashore ; Antigua !, Wullschl., Dominica !, Imr. ; [all tropical countries"]. 



2*. A. bracteata, Chois. Branches hoary-tomentose ; leaves cordate-roundish, entire, 

 sericeous-tomentose beneath; cymes contracted-corymbiform, long-peduncled ; sepals oval- 

 roimdish, mucronate, externally tomentose, one-fourth as long as the coroUa; corolla serice- 

 ous-tomentose (except at the plaits), abruptly tapering at the base. — Hook. Compan. Bot. 

 Mag. 1. t.Z. — Corolla 2§" long. — Hab. Naturalized in Jamaica!, March; Antigua!, 

 Wullschl. ; [introduced from the East Indies]. 



2. IPOMCEA, L. 



Calyx 5-leaved. Corolla campanulate or infundibular, rarely salver-shaped. Ovary 4- 

 6-ovulate: cells 2-4 ; stigma 2(-3)-lobed-capitate, rarely capitate. Capsule-valves sece- 

 ding from the dissepiment. — Climbers ; rarely trailing herbs. 



Sect. 1. Calonyction, Chois. — S^als membranaceous, at length leathery. Corolla large, 

 salver-shaped : tube cylindrical. Ovary Z-celled, ^-ovulate : no cupuUform disk. Cap- 

 sule rupturing at the base, splitting upwards into irregular valves. 



3. I.bona-nox,£. Glabrous; leaves cordate-roundish, pointleted,entireor sinuate-dentate 

 (-3-lobed) at the auricles ; peduncles 3-1 -flowered ; sepals unequal, 2 interior oval-oblong, 

 blunt, 3 exterior ovate-lanceolate, terminated by d filiform appendage, one-fourth to one- 

 sixth as long as the cylindrical corolla-tube ; stamens shortly exserted ; " capsule oblong : 

 ^ seeds glabrous." — SI. t. 96. /. 1. Rich. Cub. t. 63. — Calonyction megalocarpon, Mch. 

 C. speciosura, Chois. ex parte : Choisy's diagnosis and many of his synonyms belong to /. mu- 

 ricata, Jaoq;., a purple-flowered Calonyction, with equal, mucronate sepals. — Corolla white, 

 nocturnal : tube 3"-4" long, 2"'-3"' diam. ; open limb 4"-5" diam. — Hab. Jamaica!, List., 

 March ; Trinidad !, Cr. , [Cuba ! and Mexico ! to Buenos Ayres ! ; Pacific islands ! ; trop. 

 Asia ! and Africa !]. 



