442 XCVIIl. CONVOLVULACE^. Convolvulus. 



simple : stig. simple or 2-lobed ; caps, valvate, 2 — 4-celled, 4 — 6- 

 seeded.^ — A large genus of twilling or prostrate herbs, rarely shrubby or 



arborescent. 



Ql,3 —The generic distinctions adopted by Choisy in the Prodromus of De CandoUe, Vol. ix., appear to 

 me to be too indefinite to be generally useful in a work like the present. 1 have adopted them merely as 

 sections of the present genus. 



§ 1. Stigmas 2, Unear-cylindric, often revohite. Capsule 2-celled. 



1. C. ARVENsis. Small ISindweed. 



St. striate, angular, generally prostrate ; Ivs. sagittate, somewhat auricu- 

 late; ped. mostly 1-flowered, bibracteate near the apex; sep. roundish-ovate; 

 caps, smooth.— T.I- A twining plant, growing in fields and pastures, Maine to 

 Car., not coinmon. Stems several feet long, climbing or prostrate, a little hairy. 

 Leaves 1 — 2' long, the lower ones obtuse. Flowers small, white, often with a 

 tinge of red. The small, acute bracts are near the middle of the peduncle. Jn. 

 2. C. TRICOLOR. Trlcolored Bindweed. — St. ascending, villose; Ivs. lanee- 

 obovate, subspatulate, sessile, ciliate at base ; ped. 1-flowered, bracteate, longer 

 than the leaves ; sep. ovate-lanceolate, acttte ; cor. tricolored ; capsule villose. — 

 ® About the Mediterranean. Stem weak, 1— 3f long. Corollas yellowish in 

 the centre, white in the middle, and of a fine sky-blue on the upper part of the 

 border. July. 

 § 2. IpoMffiA. Stigma capitate, entire or 2-lobed. Capsule 2-celled, A-seeded. 



3. C. PANDURATUS. (Ipomoea. Meyer.) Wild Potato. MaJi-of-the-ea.rlK. 

 St. twining; Ivs. broad-cordate or "panduriform ; ped. long, 1 — 4-flowered; 



cat. smooth; cor. tubular-campanulate. — % In sandy fields, N. Y. toGa. Stems 

 several from the same root, 4 — 8f long, slender, smooth. Leaves 2 — 3' long and 

 of about the same width, acute or obtuse, with rounded lobes at the base, some- 

 times lobed and hollowed on the sides and becoming fiddle-shaped. Petioles 

 2—3' long. Peduncles axillary, longer than the petioles, generally branching 

 at the top, and bearing several large flowers. Corolla 2' long, purple and white. 

 July, Aug. 



4. C. LAcaNosus. (C. micranthus. Riddcll.) Small-floioered Bindvxed. 

 Minutely pubescent ; st. twining; Ivs. cordate, acuminate, angular-lobed 



or entire, on long petioles ; ped. 1 — 3-flowered, half as long as the petioles ; sep. 

 oblong-lanceolate, acute, half as long as the corolla, ciliate, lobes acute; caps. 

 pilose.—® Penn., Md. ! to Flor., W. to Ohio and 111. A small, prostrate spe- 

 cies, 2 — 6f long, in dry fields and hills. Leaves 2' by IJ', deeply cordate, often 

 deeply 3-lobed ! petioles 1—3' long. Flowers 8" diam., 9" long, white with a 

 purplish rim. Aug. Sept. 



§ 3. Pharbitis. Stigma capitate, gramdate. Ovary 3- rarely A-celled, 



cells 2-seeded. 



5. C. PURPUREOS. (Ipomoea. PA. Pharbitis hispida. Choisy.) Common 

 Morning Glory. — St. climbing and twining, retrorsely pilose; Ivs. cordate, 



entire ; fl. nodding ;' ped. 2 — 5-flowered ; pedicels thick ; cat. hispid. — (p In fields, 

 Mid. and W. States. Stems climbing many feet. Leaves roundish, heart- 

 shaped. Flowers large, beautiful, generally of a dark purple, sometimes blue, 

 flesh-colored, striped, &.c. A well known and favorite climber and free flower, 

 of ihe easiest culture. Jn. ^ f 



6. C. Nil. (Pharbitis. Choisy.) Morning Glory. 



Lvs. cordate, 3-lobed; fis. half 5-cleft; ped. shorter than the petioles, 1 — 3- 

 flowered. — A very beautiful twining plant, found wild, Penn. to Flor., but best 

 known as a garden annual. Stem and leaves somewhat hairy. Calyx very 

 hairy, the segments long-acuminate. Flowers large, the tube white and the 

 border of a clear blue color (whence its specific name. Anil or Nil, indigo). 

 It is of the easiest culture, and raised from the seed. Blossoms from July to 

 September, f 

 § 4. Batatas. Stig. capitate, 2-lobed. Ova. 4-, or by abortion, 3 — 2-celled. 



7. C. Jalapa. (C. macroihizus. Ell. Batatas Jalapa. Choisy.) 



St. creeping or twining; lvs. cordate, entire, sinuate or lobed, tomentose- 



