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Project Name Data (Last Modified On 5/30/2013)
 

Flora Data (Last Modified On 5/30/2013)
Genus Cynanchum L.
PlaceOfPublication Sp. P1. 212. 1753
Note TYPE: C. acutum L.
Synonym Metastelma R. Br., Mem. Wern. Soc. 1: 52. 1809. TYPE: M. parviflora (Sw.) R. Br. ex Schultes. Tassadia Dcne. in DC., Prod. 8: 579. 1844. TYPE: (not seen). Metalepis Griseb., Cat. P1. Cub. 179. 1866. TYPE: M. cubensis (A. Rich.) Griseb.
Description Usually scandent herbs, sometimes suffrutescent, glabrous or pubescent. Leaves opposite, coriaceous to membranaceous, frequently small and narrow. In- florescences umbelliform or racemiform, sessile or pedunculate. Flowers with the calyx deeply 5-lobed, generally 5-glandular at the base within, the lobes often obtuse and small; corolla mostly whitish or yellowish, occasionally pink to brownish-purple, urceolate to campanulate to subrotate, usually small, 5-lobate, the lobes often pubescent within; stamens 5, the corona mostly of 5 distinct or connate segments, laminate to filiform, sometimes fleshy and minute, rarely absent, sometimes variously compound or with internal processes, the filaments
Habit herbs
Description connate into a short to elongate tube, the anthers terminated by an inflexed membrane; pollinia usually ovoid or oblong, pendulous; stigma apically flat or variously elaborated into a beak. Fruit single or paired follicles, smooth, usually terete or nearly so, commonly slender and acuminate, sometimes ovoid.
Distribution A large genus, which, when considered in the wide sense, includes in excess of 200 species. These are widely distributed throughout temperate and tropical regions of both hemispheres.
Key a. Leaves basally cordate; flowers large, the petals 2.5 mm long or more; follicles large, not paired. b. Inflorescence racemose; corolla lobes glabrous inside, more than 6 mm long (sub- genus Roulinia) ...... 6. C. magdalenictim bb. Inflorescence paniculate; corolla lobes white pubescent inside, 3.5 mm long or less (subgenus Metalepis) ...... 5. C. cubense aa. Leaves not cordate; flowers small, the petals less than 2 mm long; follicles small, usually paired. c. Leaves thick, dark shiny green above, paler beneath; umbels in spreading racemi- form inflorescences (subgenus Tassadia). d. Sepals equaling or exceeding the corolla tube in length ...... 1. C. recurvum dd. Sepals shorter than the corolla tube -2. C. apocynellum cc. Leaves thin, uniformly colored above and beneath; simple unbranched umbelliform inflorescences (subgenus Metastelma). e. Corolla lobes glabrous inside; corona segments ovate-oblong, overtopping the gynostegiun ...... 3. C. glaberrimum ee. Corolla lobes pubescent inside; corona segments subulate, equaling the gyno- stegium ...... 4. C. infimicola
 
 
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