368 CONVOLVULACE^. (CONVOLVULUS FAMILY.) 



vated for ornament, and one, the Sweet Potato, for its edible farinaceous 

 roots; those of several species are cathartic ; e. g. Jalap.) 



Tribe I. DICHONDRE^. Carpels 2 or 4, distinct or nearly so ; styles 2, basilar. 

 Creeping herbs. 



1. Dicliondra. Corolla deeply 5-cleft. Pistils 2, one-seeded. 



Tribe II. CONVOL<VUL.Eu3E. Ovary entire. Leafy plants, mostly twiners 



2. Iponioea. Style undivided, with stigma capitate or 2 - 3-globose. 



3. Convolvulus. Style undivided or 2-cleft only at apex; stigmas 2, linear-tiliforni to 

 subulate or ovate. 



4. Brevi'eria. Style 2-cleft or 2-parted; the divisions simple; .stigmas capitate. 



5. Evolvulus. Styles 2, each 2-cleft; stigmas linear-filiform. Not twining. 



Tribe III. CUSCUTE.^. Ovary entire. Leafless parasitic twining herbs, never green. 

 Embryo filiform, coiled, without cotyledons. 



G. Cuscuta. The only genus of the group. 



1. DICHONDRA, Forst. 



Calyx 5-parted. Corolla broadly bell-shaped, 5-cleft. Stamens included. 

 Styles, ovaries, and utricular 1 - 2-seeded capsules 2, distinct. Stigmas thick. 

 — Small and creeping perennial herbs, soft-pubescent, with kidney-shaped 

 entire leaves, and axillary 1-flowered bractless peduncles. Corolla small, yel- 

 lowish or white. (Name from Sis, double, and xo'^'^pos, a grain; from the 

 fruit.) 



1. D. ripens, Forst. Leaves round-kidney -shaped, pubescent, green 

 both sides; corolla not exceeding the calyx (1-1^'' loi^g)- — ^^et ground, 

 Va. to Tex., near the coast. 



2. IPOMCEA, L. Morning Glory 



Calyx not bracteate at base, but the outer sepals commonly larger. Corolla 

 salver-form or funnel-form to nearly campanulate ; the limb entire or slightly 

 lobed. Style undivided, terminated by a single capitate or 2 -3-globose stig- 

 ma. Capsule globular, 4 - 6 (by abortion fewer)-seeded, 2-4-valved. (Name, 

 according to Linneeus, from ixj/, a Bindiveed, and ofioios, like ; but Xxp is a icorm.) 

 § 1. QUAMOCLIT. Corolla salver-form, or with somewhat funnel-form but nar- 

 roiv tube; stamens and sti/le exserted ; foicers red. Annual twiners 



I, QuAMOCLiT, L. (CvpRESS-ViNE.) Leaves piunatelv parted iuto linear- 

 thread-shaped delicate parallel lobes; peduncles 1-flowered; corolla narrow, 

 scarlet-red, or sometimes white. (Quamoclit vulgaris, Choisi/.} — Sparingly 

 spontaneous southward. (Trop. Amer., etc.) 



I. coccfxEA, L. Leaves heart-shaped, acuminate, entire or angled ; sepals 

 awn-pointed ; corolla light scarlet (1' long). (Quamoclit coccinea, Moench.) — 

 River-banks, etc., Ohio to 111., Va., and southward. (Probably indigenous in 

 N. Mex. and Arizona.) 



§ 2. IPOMCEA proper. Corolla funnel-form or nearly campanulate, contorted 



in the bud ; stamens and style not exserted. 



* (Morning Glorv.) Lobes of stigma and cells 3 , sepals long and narrow, 

 attenuate upicard, mostly hirsute below . corolla purple, blue, and white. 



I. hederXcea, Jacq. Stems retrorsely hairy , leaves heart-shaped, 3-lobed, 

 the lobes acute or acuminate ; peduncles short, or rather long, 1 - .'i-flowered ; 

 calyx densely hairy below; corolla white and purple or pale blue (1-1-^' 

 long). (I. Nil. of Manual, not Roth.) — Waste and cultivated ground, Penn. 

 to rla., and La. (Trop. Amer.) 



