CONVOLVUI ACE.E. (CONVOLVULUS FAMILY.) 8o3 



ornament, and one, the Sweet Potato, for its edible farinaceous roots : those 

 of several species are cathartic; e. g. Jalap.) — There are three suborders, 

 or rather strongly marked tribes. 



Synopsis. 



Tribe I. CONVOIiVULEJE. Embryo with broad and foliaceous cotyledons crumpled 

 in the seed Ovary 2-8- (or falsely 4-) celled. Pod usually septifragal — Leafy plants. 



* Style 1, undivided. 

 <- Calyx naked, i. e. not enclosed or surrounded by bracts. 



1. QUAMOCLIT. Stamens exserted. Corolla cylindrical-tubular, with a spreading border. 



Stigma capitate-2-lobed. Pod 4-ceIled ; the cells 1-seeded 



2. 1P0MU2A. Stamens included. Corolla funnel-form or bell-shaped. Stigma capitate, of- 



ten 2- 3-lobed Pod2-3-celled; cells 2-seeded. 

 3 CONVOLVULUS. Stigmas 2, elongated, linear. Otherwise much as in No 2. 



+- -t- Calyx surrounded by 2 broad bracts. 

 4. CALYSTEGIA. Stigmas 2, linear or oblong. Pod imperfectly 2-celled, 4-seeded. 



* * Style 2-cleft, or styles 2, rarely 3. 



6. STYLISMA. Styles or their divisions simple : stigma depressed-capitate. 



Tribe II. DICHONDREJE. Pistils 2, separate. Otherwise nearly as Tribe I. 

 <5. DICHONDRA. Corolla bell-shaped. Pods 2, each I-seeded. 



Tribe III. CUSCUTIMEJE, Embryo spiral, slender, destitute of cotyledons. Ovary 

 2-celled. — Leafless parasitic twiners. 



7. CUSCUTA. The only genus of the group. 



1. QUAMOCLIT, Tourn. Cypress- Vine. 



Sepals mostly mucronate or awned. Corolla cylindrical-tubtdar, with a small 

 spreading border. Stamens and stylo protruded. Stigma capitate-2-lobed. 

 Pod 4-celled ; the cells 1-seeded. — Annual twiners, with red or crimson flowers. 

 (An aboriginal, probably Mexican, name.) 



1. 4£. coccinea, Moench. Leaves heart-shaped, acuminate, entire, or 

 angled; sepals awn-pointed ; corolla light scarlet (1' long). (Ipomcea coccinea, 

 L.) — River-banks, &c, Ohio, Virginia, and southward. (Nat. from Trop. 

 Amer. or Ind.) 



Q. vulgaris, the cultivated Ctpbess-Vine, is becoming spontaneous in 

 the South. 



2. IPOMCEA, L. Morning-Glort. 



Calyx naked at the base. Corolla bell-shaped, funnel-form, &c. Stamens 

 included. Stigma capitate, often 2 -3-lobed. Pod 2-celled, or in one group 3- 

 celled; the cells 2-seeded. (Name, ex L. from 'ty, Inos, a Bindweed [which it is 

 not], and ofioios, like.) 



§ 1 . PHARBITIS, Choisy. — Pod 3- (rarely 4-) ceiled; the cells 2-seeded. 

 1. I. purpurea, Lam. (Common Morning-Glory.) Stems retrorsely 

 hairy; leaves heart-shaped, 'icuminate, entire; peduncles long umbellately 3-5- 

 flowered ; calyx bristly-hai y below ; corolla funnel-form (2 long), purple vary- 



