466 CONVOLVULACEjE. 



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

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

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

 superior racemose. 



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

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

 Pict. t. 166. — Corolla-tube 6"-7" long. — Hab. Trinidad !, Lockh., in savannahs ; [Haiti ; 

 New Mexico ! to Venezuela !]. 



CXVII. CONVOLVULACEjE. 



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

 celled, rarely paracarpous or apocarpous : ovules of each carpel 2-1, 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 Ipomcea, viz. /. tuberosa, cathartica, macrorrhiza, and acetosifolia. The tubers of 

 Ipomcea 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. ARGYREIA, Lour. 



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

 stigma 2-lobed-capitate. Pericarp indehiscent. — Climbers; flowers large; ovary in our 

 species supported by an annular disk. 



1. A. tiliifolia, Wight. Puberulous ; 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, Chois. — Corolla rosy, 3" long. — Ua-b. 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-corymbif orm, long-peduncled ; sepals oval- 

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

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

 Mag. 1. t. 3. — Corolla 2s" 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. Caionyction, Chois. — Sepals membranaceous, at length leathery. Corolla large, 

 salver-shaped : tube cylindrical. Ovary 2-celled, 4-ovulate .- no cupuliform disk. Cap- 

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



3. I.bona-nox, L. Glabrous; leaves cordate-roundish, pointleted, entire or sinuate-dentate 

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

 blunt, 3 exterior ovate-lauceolate, terminated by a filiform appendage, one-fourth to one- 

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

 seeds glabrous." — SI. t. 96. /. I. Rich. Cub. t. 63.— Calonyction megalocarpon, Rich- 

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

 ricata, Jacq., 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 I, Dist., 

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

 Asia ! aud Africa !]. 



