Calysteoia. XCVIII. CONVOLVULACE^. 443 



pubescent beneath ; ped. scarcely equaling the long petioles, 1 — 3-flowered ; sep. 

 roundish-ovate, pubescent ; seeds villose, with long hairs. — 11. Western States ! 

 frequent, to Flor. and La. Stems 2 — 6f in length, on the ground, or trailing 

 over fences, &c. Leaves 2—3' long, the petioles 2 — 5'. Corolla large (2J— 3' 

 diam.) and showy, white or rose-colored, purple at base. July, Aug. — The root 

 is tuberous and mildly purgative. 



8. C. Batatas. (Batatas edulis. Choisy.') Sweet Potato. — St. creeping, 

 rarely twining; lis. cordate, hastate, angular, 5-veined, smoothish; pcd. long; 

 fls. fascicled ; scp. lanceolate, acuminate. — (p The sweet potato is native of 

 both Indies and cultivated in all tropical climates. Not only the tubers, but 

 the leaves and tender shoots are boiled and eaten. The tubers are sweet and 

 considered nutritive. This is the potatn of the old English botanists, of Shake- 

 speare, and their cotemporaries, the Sdanuvi tuberoswm then being unknown. 

 The stem is rQund, hispid, prostrate, creeping, sending out scattered, oblong 

 tubers which are purplish without. Flowers large, purple or white. | 



2. aUAMOCLIT. Tourn. 



Crr. Kvafio;, a bean, xXiroj, dwarf; resembles the climbing bean, but smaller. 



Sepals 5, mostly mucronate ; cor. tubular-cjlindric ; sta. exserted ; 

 sty. 1 ; stig. capitate, 2-lobed ; ovary 4-celled, cells 1 -seeded. — Twin- 

 ing herbs, mostly American. 



1. Gl. VULGARIS. Choisy. (Ipomoea. Linn. Convohnilus. 1st. edit.) Jasmine. 

 Bindweed. Cypress Vine. — Z,cs. pinnatifld to the midvein, segments linear, 



parallel, acute ; ped. 1-flowered ; scp. ovate-lanceolate. — Q An exceedingly 

 delicate vine, Penn. Eaton, Southern States ! generally' cultivated. Stems gla- 

 brous, very slender, twining and climbing to the height of 5 — lOf Flowers 

 much smaller than those of the common morning glory, scarlet, varying to 

 crimson and rose-color. Trained upon twine it forms a most delicate and 

 beautiful awning. July, Aug. 



2. Q,. cocciN-EA. Moench. (Ipomjea. Linn. Convolvulus. Spreng.) 

 Lvs. cordate, acuminate, entire or angular at base ; pcd. elongated, about 



5-flowered ; cat. awned. — Southern States, naturalized in the Western, occa- 

 sionally cultivated. Flowers varying from yellow to scarlet, f 



3. STYLISMA. Raf. 



The name has reference to the plurality of the styles. 



Sepals 5, equal ; cor. campauulate ; ovary 2-celled ; styles 2, rarely 

 3. stigmas thick ; sta. included. — % Slender., creeping. 



S. TENELLi's. Wood. fS. cvoUiiloides. Choisy, Convolvulus tenellus. 



Lam. C. Sherardi. PA.) — Dry, sandy or rociiy soils, Ohio, to Flor. Stem 



long, prostrate, branching, pubescent. Leaves lance-linear or linear, obtuse, 1' 



in length, with short petioles. Peduncles longer than the leaves, 1 — 5-flowered. 



Sepals ovate-lanceolate, 3" long. Corolla twice longer, hairy outside. 



4. CALYSTEGIA. Br. 



Gr. KaAi)?, calyx, CTcyr], a covering ; alluding to the conspicuous calycine bracts. 



Calyx 5-parted, included in 2 large, foliaceous bracts ; cor. cam- 

 pauulate, 5-plicate ; sta. subequal, shorter than the limb ; ova. half 

 bilocular, 4-ovuled ; sty. simple ; stig. 2, obtuse : caps. 1 -celled, 4-seed- 

 ed. — Herbs twming or prostrate. Ped. l-flowered, solitary. 



1. C. .spiTHAMiEus. Br. (Convolvulus. Li7in. C stans. Michx.) Erect 

 Bindweed. — St. erect or assurgent; lvs. oblong-lanceolate, subcordate, 

 hoary-pubescent; ped. 1-flowered, generally longer than the leaves. — 1\. An 

 erect, downy species, (a span) 8 — 10' high, found in fields and hilly pastures. 

 Can. to Penn., W. to 111. Stem branching, leaty, bearing one, often two or 

 more large, wliite flowers, on peduncles 2 — 4' long, issuing from near the root. 

 Leaves 2 — 3' long, i as wide, oval, with an abrupt, cordate base, and on peti- 

 oles i as long. Bracts concealing the calyx. June. 

 38 



