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(Last Modified On 5/30/2013)
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(Last Modified On 5/30/2013)
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Genus
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Sarcostemma R. Br
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PlaceOfPublication
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Mem. Wern. Soc. 1: 50. 1809.
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Note
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TYPE: S. viminale (L.) R. Br.
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Description
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Slender vines, herbaceous or suffrutescent, pubescent or glabrous, sometimes glaucous. Leaves opposite. Inflorescence axillary, umbellate, usually pedunculate. Flowers with the calyx small, 5-lobed, minutely 5-glandular within at the base, the lobes acute; corolla generally white, greenish-white, or sometimes purplish, broadly campanulate or subrotate, shallowly or deeply 5-lobate, usually de- pressed globose in bud; stamens inserted on the base of the corolla, the corona of 5 inflated vesicles adnate to the base of the staminal tube, usually equaling or overtopping the gynostegium, the apices flat, concave or convex, almost al- ways joined by a fleshy annulus which is adnate to the corolla throat, its margin entire, filaments connate into a short tube, the anthers terminated by an inflexed membrane; pollinia pendulous, oblong or elongated; stigma flat or umbonate or with a short bifid apical beak. Fruit a single follicle usually slender, terete, acuminate, smooth, glabrous or pubescent.
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Habit
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vines
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Reference
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Holm, R. W. The American species of Sarcostemma R. Br. (Asclepiadaceae). Ann. Missouri Bot. Gard. 37: 477-560. 1950.
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Distribution
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A genus of about 35 species found throughout warm and tropical regions. The New World species are concentrated in South Amercia, the following three reported from Panama.
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Key
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a. Leaf bases cordate ...... 1. S. bilobum aa. Leaf bases attenuate to rounded, occasionally truncate but not cordate. b. Corolla rotate-subcampanulate, not constricted at the throat; ovaries white seri- ceous ...... 2. S. clausum bb. Corolla salverform, the tube constricted at the throat; ovaries glabrous ...... 3. S. glaucum
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