208 CONVOLVULACE^. Dichondra. 



Tkibe II. CONVOLVULEiE. Ovary entire. Plants with ordinary foliage, not 

 parasitic. 



# Corolla plicate at the sinuses and the plaits dextrorsely convolute : cotyledons broad, 

 often emarginate. 



2. IPOMCEA. Style undivided, terminated by a single capitate or 2-3-globose stigma. 

 Corolla from salverform or funnelform to nearly campanulate. Ca,psule globular, 4r-6- (or 

 by abortion fewer-) seeded, 2-4-valved. 



3. JACQUEMONTIA. Style undivided ; stigmas 2, ovate or oblong, thick but somewhat 

 flattened. Otherwise as Ipomaa and Convolvulus, and intermediate between the two. 



4. CONVOLVULUS. Style undivided or 2-cleft only at the apex : stigmas 2, from linear- 

 filiform to subulate or ovate, when broad always thin and flat. Stamens included. Corolla 

 from funnelform to campanulate. Capsule globose, 2-cx'Iled, or sometimes imperfectly 

 4-eelled by spurious partitions between the two seeds, or by abortion 1-celled, mostly 

 2— t-valved. 



5. BRE WERIA. Style 2-cleft or 2-parted ; the divisions simple, each bearing a capitate 

 stigma. Corolla, stamens, and capsule of Convolvulus, 



6. E VOLVULUS. Styles 2, distinct or sometimes united below, each 2-cleft: stigmas 

 linear-filiform or somewhat clavate. Corolla from funnelform to almost rotate. Otherwise 

 like Coni-oh-ulus on a small scale, not twining. 



* * Corolla not plicate in the bud, 5-cleft : cotyledons linear, biplicate, entire. 



7. CRESSA. Styles 2, distinct, entire : stigmas capitate. Calyx of 5 nearly equal sepals, 

 equalling the oblong-campanulate tube of the corolla ; the limb of tlie latter 5-parted into 

 oblong-ovate lobes, lightly convolute-imbricate and somewhat induplicate in the bud. 

 Filaments filiform, exserted from the throat of the corolla. Ovary 2-celled, 4 ovuled. 

 Capsule by abortion often 1-seeded. Stems not twining. 



Tribe III. CUSCUTE^. Ovary entire. Leafless parasitic twining herbs, destitute 

 of foliage and of all .green color; the spirally coiled filiform embryo even destitute 

 of cotyledons. Corolla imbricated in the bud, appendaged below the stamens. 



8. OUSCUTA. The only genus. 



1. DICHONDRA, Forst. (Formed of 54', double, and lov^Qog, grain or 

 roundish mass, from the twin fruit.) — Small prostrate and creeping perennials 

 (found almost all round the warmer parts of the world, but most in America) ; 

 with filiform stems, slender petioles to the reniform or round-cordate entire leaves, 

 and naked peduncles bearing a single small flower. Corolla greenish or yellowish- 

 white. Carpels pubescent. — Char. Gen. 39, t. 20. The following maybe the 

 only species. 



' D. repens, Porst. Soft-pubescent or slightly sericeous, but green or greenish : leaves 

 mostly with a deep basal sinus : sepals obtuse, at length obovate with narrowed base or 

 spatulate : corolla-lobes ovate, nearly glabrous. — Lam. 111. t. 18.3 ; Smith, Ic. Ined. t. 8. 

 D. sericea, Swartz, Prodr. 54, & Fl. Ind. Occ. t. 11, a small and silky form. D. Carolinensis, 

 Michx. Fl. i. 1.36, a large and greener form. D. repens, macrocalyx, &, sericea, Meissn. in Mart. 

 Fl. Bras. vii. 357. — Wet ground, Virginia to Texas, near the coast, and Arizona. (Trop. 

 & S. Am., Asia, Oceanica, Australia, S. Africa.) 

 D. argentea, Willd. Canescently sericeous and silvery : leaves mostly with a shallow- 

 sinus or even truncate, and with comparatively short petioles : sepals from oblong-oval to 

 lanceolate : corolla-lobes oblong-lanceolate, acutish, villous outside. — Hort. Berol. 297, 

 t. 81 ; Meissn. 1. c. — S. Te.xas to Arizona. (Mex., S. Amer.) 



2. IP0MC£A, L. Morning Glort. (According to Linna?us, composed 

 of itp, tnog, and ofAows, like ; but i'xp is a worm.) — A large genus, mainly of 

 twining herbs, some prostrate, difEuse, or even erect : fl. summer. Calyx not 

 bracteate at base, but the outer sepals commonly larger. Limb of the corolla 

 entire or barely 5-angulate, or slightly 5-lobed. Valves of the capsule usually 

 septifragal. Cotyledons broad, commonly 2-lobed. Genus here taken in the 



