334 CONVOLVULACFJE. (CONVOLVULUS FAMILY.) 



ing to white. ® (Convolvulus purpureus, L. Pharbitis hispida, Choisy.) — 

 Around dwellings, escaping from cultivation. (Adv. from Trap. Amer.J 



2. I. Nil, Roth. (Morning-Glort.) Stems retrorscly hairy ; leaves heart- 

 shaped, 3-lokd, the lobes acute or acuminate ; peduncles short, or rather long, 

 1 - 3-flowered ; calyx densely hairy below ; corolla white and purple or pale 

 blue. (£) (Conv. Nil. & C. hederaceus, L.) — Banks and near dwellings, from 

 Maryland southward. (Adv. from Trop. Amer. ■?) 



§2. IPOMCEA, Choisy.— Pod 2-celled; the cells 2-seeded. 



3. I. lacilBldsa, L. Rather smooth; stem twining and creeping, slen- 

 der ; leaves heart-shaped, pointed, entire or angled-lobed, long-petioled ; pedun- 

 cles short, 1-3-flowercd; sepals lance-oblong, pointed, bristly-ciliate or hairy, half 

 the length of the sharply 5-lobed (white) corolla; pod sparingly hairy. (T) (C. 

 micrantlms, Riddel!.) — Woods and fields, Penn. to Illinois, Virginia, and south- 

 ward. Aug. — Corolla £'- £' long. 



4. I. paiidui'ista, Meyer. (Wild Potato-vine. Man-of-the-Earth.) 

 Smooth or nearly so when old, trailing or sometimes twining ; leaves regularly 

 heart-shaped, pointed, occasionally some of them contracted at the sides so as 

 to be fiddle-shaped ; peduncles longer than the petioles ; 1 - 5-flowered ; sepals smooth, 

 ovate-oblong, very obtuse; corolla open-funnel-form (3' long), white with purple in 

 the tube. U — Sandy fields and dry banks, from Connecticut to Illinois and 

 southward. June - Aug. — Stems long and stout, from a huge thick root, which 

 often weighs 10 - 20 pounds. Flowers opening in bright sunshine. 



I. sagittAta (Conv. sagittifolius, Michx.) is said by Pursh to grow in 

 Virginia; but it has not lately been met with so far north. — I. commutata, 

 Rccm. <j- Sch. (I. triconcarpa, Ell.) with purple flowers larger than those of No. 3, 

 is likely to occur in S. Virginia and Kentucky. 



Batatas edulis, Choisy (Conv. Batatas, L.), is the cultivated Sweet 

 Potato. 



3. COIVVOLYIJLUS, L. Bindweed. 



Calyx naked at the base. Corolla mostly bell-shaped. Stamens included. 

 Style 1 : stigmas 2, linear, often revolute. Pod 2-celled; the cells 2-seedcd.— 

 Stems twining, procumbent, or often erect-spreading. Flowers mostly opening 

 at dawn. (Name from convolvo, to entwine.) 



1. C. arvensis, L. (Bindweed.) Stem procumbent or twining, and 

 low ; leaves ovate-oblong, arrow-shaped, with the lobes at the base acute ; pe- 

 duncles mostly 1 -flowered; bracts minute, remote; corolla (f long) white or 

 tinged with reddish. U — Fields, near the coast: likely to become a trouble- 

 some weed. June. (Nat. from Eu.) 



4. CAIYSTECIA, R.Br. Bracted Bindweed: 



Calyx enclosed in 2 large and mostly heart-shaped leafy bracts : sepals equal. 

 Corolla bell-funnel-form, the border obscurely 5-lobed or entire. Stamens in- 

 eluded. Style 1 : stigmas 2, linear or oblong. Poc imperfectly 2-celled or 1 

 tolled, 4-seeded.— Perennials, with heart-shaped or arrow-shaped leaves, and 



