CONVOLVULACE^E. (CONVOLVULUS FAMILY.) 333 



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. CON VOL VTIIjE JE* Embryo with broad and foliaceous cotyledons crumpled 

 in the seed. Ovary 2 - 3- (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-celled ; the cells 1-seeded. 



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



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



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

 - *- 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. 



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



TRIBE II. DICHONDRE^. Pistils 2, separate. Otherwise nearly as Tribe 1 



6. DICHONDRA. Corolla bell-shaped. Pods 2, each 1-seeded. 



TRIBE III. CUSCTJTINEJE. Embryo spiral, slender, destitute of cotyledons. Ovary 

 2-celled. Leafless parasitic twiners. 



7. CUSCUTA. The only genus of the group. 



1. qiTAMOCL.IT, Tourn. CYPRESS- VINE. 



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

 spreading border. Stamens and style 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. Q. coccfNEA, Moench. Leaves heart-shaped, acuminate, entire, or 

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

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

 Amer. or Ind.) 



Q. VULGARIS, the cultivated CYPRESS-VINE, is becoming spontaneous in 

 the South. 



2. IPOMCEA, L. MORNING-GLORY. 



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, ITTOS, a Bindweed [which it is 

 not], and o/xoios, like.) 



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

 1. I. puRpfrREA, Lam. (COMMON MORNING-GLORY.) Stems retrorsely 

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

 flowered ; calyx bristly-hai y below ; corolla funnel-form (9- long), purple vary- 



