branaceous, glabrous; petioles to 15 mm. long; inflorescences solitary at the 

 uppermost nodes, several- to many-flowered; peduncles slender, 1-4 cm. long; 

 pedicels 1-1.3 cm. long, usually somewhat suffused with purple; flowers small; 

 calyx lobes oblong-elliptic, about 1 mm. long, sparsely and minutely pilosulose; 

 corolla reflexed-rotate. white and usually suffused with pale-pink, the lobes 3-4 

 mm. long; gynostegium stipitate. white; column cylindric, about 1 mm. long and 

 wide; hoods cucullate. rounded at the tip, about 2 mm. long, slightly longer than 

 the anther head; horn basal, narrow-acicular, somewhat longer than the hoods, 

 slightly arching over the anther head; follicles pendulous on defiexed peduncles, 

 rather broadly ovoid-fusiform with a rather long apical beak, 4-7 cm. long, 

 1-2.5 cm. broad, smooth, glabrous; seeds broadly oval, about 15 mm. long, 

 without a coma. 



Low swampy ground, frequently with bald cypress, alluvial woods, sloughs and 

 ditches mostly in s.e. Tex., Apr.-Aug.; from S.C., s. to Fla. and w. to Tex., s. 

 Mo.. III. and s.w. Ind. 



2. Cynanchum L. 



About 150 species mostly in the warmer regions of both hemispheres. 

 1. Cynanchum angustifolium Pers. 



Vine slender, glabrous, somewhat succulent, twining, to 1 m. or more long; 

 leaves short-petioled. narrowly linear, acute, to 8 cm. long and 5 mm. wide; pedun- 

 cles slender, mostly shorter than the leaves; cymes several-flowered; calyx 2-2.5 mm. 

 long, the lobes ovate-lanceolate to lanceolate and acute; corolla purplish or greenish- 

 white, 6-8 mm. broad, the lobes ovate and acuminate; crown lobes 1.5-2 mm. long, 

 retuse; follicles slender, to 7 cm. long and 5 mm. thick. Lyonia palustris (Pursh) 

 Small, Seutera palustris (Pursh) Vail, Cynanchum palustre (Pursh) Heller. 



Climbing over shrubs and herbs in and on the edge of salt marshes and in moist 

 sandy soils, local along the Tex. Gulf Coast, May-Aug.; from N.C. to Fla. and 

 Tex.; also Bah. I. and W.I. 



3. Sarcostemma R. Br. 



A world-wide genus of about 10 species. 



1. Sarcostemma cynanchoides Dene. 



Stems twining or trailing to 1 m. or more long, much-branched, glabrous to 

 sparsely puberulent; leaves with petioles to 2 cm. long, broadly to narrowly ovate- 

 lanceolate to triangular-lanceolate or linear to linear-lanceolate, acute to acuminate 

 at apex, cordate to hastate or rounded-cuneate at base, to 6 cm. long and 35 mm. 

 wide, thin-membranaceous. sparsely puberulent on both surfaces, with one or 

 more glands on the midrib at the base; inflorescences umbelliform, as many as 

 20-flowered: peduncle slender, to 55 mm. long; bracts linear, minute; pedicels 

 slender, to 17 mm. long; calyx lobes 5, ovate to ovate-linear, 2-3 mm. long, pilosu- 

 lose without, glabrous within; squamellae absent to solitary or paired; corolla 

 rotate-subcampanulate. greenish-white to purple or pinkish, the tube 1-2 mm. 

 long; corolla lobes 5, ovate, acute to acuminate, 5-7 mm. long, glabrous within, 

 fimbriate-ciliate; ring of the crown thin, revolute, not adnate to the base of the 

 crown-vesicles that are 1.5 mm. long; follicles fusiform, to 7 cm. long, lanceolate 

 in outline, attenuate above, puberulent. 



In sandy or rocky soils, usually climbing on shrubs, and in marshes and banks 

 of irrigation ditches, in the w. half of Tex., Okla. (Waterfall), N. M. (Sierra Co.) 

 and Ariz. (Yavapai Co.), Apr.-Sept.; from Okla. and Tex., w. to Calif., s. to 

 cen. Mex. 



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