ORDER 95. CONVOLVULACEJE. 259 



2. BATATAS, Humph. SWEET POTATO. Cal. of 5 sepals. Cor. cam- 

 panulate, with a spreading limb. Stam. 5, included. Style simple, stigma 

 capitate, 2-lobed. Capsule 4-celled, 4-valved, with 4 erect seeds. ^ Herbs, 

 or shrubby, with milky juice. 



1 B. llttora.Ha Chois. Creeping, sending ont rannere ; Ivs. smooth, thick, sinuata 



with 35 rounded lobes and cordate at base ; ped. 1-flowered, as long as the leaf; sup. 

 abrupt-pointed; seeds tomentous ; corolla white, if. Coast sands, S. Aug. Oct. 



2 B. macrorhiza Wood. Creeping or twining; Ivs. cordate, lobed or entire, soft- 



downy beneath ; ped. 1-5-flowered, -shorter than the leaves ; cor. purple ; seeds vil- 

 lous. V Sands, S. C. to Fla. Root very large. (Ipomcea Michauxii Swt.) 



3 B. edulfs. Sweet Potato. Lvs. 3-5-lobed or angled, lobes acute ; ped. 3-5-flowere., 



as long as the petioles, u W. Indies. Extensively cult, for its sweet tubers. Purple. 



3. PHARBITIS, Chois. MORNING GLORY. Calyx 5-sepalled. Cor. bell- 

 tunnel-form. Sty. single, stig. capitate, granulate. Ov. 3-(rarely 4-)celled, 

 cells 2-seeded. ^> Beautiful, cultivated and spontaneous. 



1 P. purpurea Wood. Twining stem clothed with reversed hairs; Ivs. cordate, en- 



tire ; ped. 2-5-flowered ; corolla large, dark purple, varying to blue, flesh-color, &c , 

 appearing _i 'ong succession, in fields and gardens. June, July. 



2 P. Nil Chois. Some hairy ; leaves cordate, 3-lobed ; ped. 1-3-flowered, shorter 



than the petioles ; sepals ovate, long-pointed, corolla tube white, border indigo (nit) 

 blue. Gardens, and in fields. July, Aug. J 



3 P. HEDEHACEA. from S. Am., differs from P. Nil in the middle lobe of its Ivs., which is 



ovate, and contracted at base ; ped. 1-flwd. ; cor. 2' or more broad, varying in purple 

 and blue, blue and white, pink and white, &c. The hybrid P. I.IMBATA has a purple 

 star with a white border and leaves scarcely lobed. (T) 



4 P. LEARII, from Mexico, has ped. longer than the cordate, velvet-silky leaves, each 



bearing a cluster of mageuta-blue-red flowers. Greenhouse. ~U. 10 15f. 



4. IPOMCEA, L. Cal. 5-sepalled. Cor. bell-funnel-form. Sta. included. 

 Style 1, stigma capitate. Ov. and capsule 2-celled, cells 2-seeded. Herbs, 

 shrubs, or trees. Our species are herbs creeping or climbing. 



* Flowers capitate, involucrate, small, blue. Sepals hairy No. 1 



* Flowers separate. a Sepals bristly ciliate, capsules somewhat hairy Nos. 2, 3 



a Sepals glabroas. o Flowers purple. Maritime Nos. 4, 5 



b Flowers white, rarely yellow. . .Nos. 68 



1 1. tamiiifolia L. Hairy; leaves ovate, cordate, acuminate, large, equalling the 



peduncle? : fls. crowded, 9", with linear bracts and sepals, (f) Ga. to La. Jl. Sept. 



2 I. commutata 11. & S. Smoothish ; Ivs. cordate, entire or 3-lobed: ped. as long 



as the petioles ; flowers 2 5, purple to pink, 18" ; sep. 5". Fields, S. July Oct. 



3 I. lacnuosa L. Pnberulent ; Ivs. cordate, entire or angular-lobed ; ped. t as long 



as the potioles ; flowers 13, white, with a purplish rim, 1', sepals } as long. Dry 

 fields and hills, Penu. to 111., and S. 2 6f. August, September. 



t I. Pes-apr! Sw. Roughish ; leaves roundish, emarginate or 2-lobed, thick ; ped. 

 as long as the petioles ; fls. 1 5, purple, 3' long. Coasts of Ga. and Fla. June + . 



5 I. sagittlfolia (MxJ Glabrous; Ivs. cordate-sagittate ; ped. as long as the petiole, 



much shorter than the one large (3') purple flower. U Marshes, S. Jnne + . 



6 1. siiiu ta O't. Lvs. palmately 7-cleft, varying to sinuate-lobed ; segments pinna- 



tifld ; ped. 1- or 2-flowered; corolla white, 1'. U Ga., Fla. 20f. July October. 

 T I. clllolata. Pers. Leaves cordate, entire, acuminate; ped. 1-flowered, 2-bracted 



above ; corolla lartre. yellow ; sepals 8" long. 2{ N. Car. and Tenn. 

 8 I. pandurata Meyer. Wild Potato. Leaver? broad-cordate to panduriform ; ped 



