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(Last Modified On 5/30/2013)
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(Last Modified On 5/30/2013)
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Species
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Cynanchum cubense (A. Rich.) Woodson
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PlaceOfPublication
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Ann. Missouri Bot. Gard. 28: 213. 1941.
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Synonym
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Gonolobus cubensis A. Rich., Fl. Cub. Fanerog. 2: 98. 1845. TYPE: Cuba, Valenzuela (P, not seen). Metalepis cubensis (A. Rich.) Griseb., Cat. PI. Cub. 180. 1866. Cynanchum peraffine Woodson, Ann. Missouri Bot. Gard. 31: 236. 1944. TYPE: Mexico, Calderone 258 (GH, US).
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Description
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Large herbaceous vines with abundant latex, the stems glabrous or nearly so, hollow. Leaves widely ovate, deeply cordate when mature, or shallowly cordate, apically acuminate to short-apiculate, glabrous, 10-30 cm long and 7-49 cm wide with a cluster of laminar glands at the base; petioles 5-12 cm long, glabrate. Inflorescence at first racemose, branching to become a panicle of racemes to 30 cm long, the branches minutely puberulent, densely so when younger; pedicels mostly 2-4 mm long. Flowers with the calyx deeply lobed, the lobes shorter than the corolla lobes, ovate-lanceolate, acuminate, puberulent to glabrate on the outside, 1.5-3.0 mm long and 1.0-1.4 mm wide; corolla greenish-white, rotate, the lobes at anthesis reflexed, with revolute margins, glabrous outside, densely white papillose inside, 3.0-3.3 mm long and 1.3-1.4 mm wide; corona cyathiform, shallowly 5-lobed, shorter than the gynostegium, the lobes truncate with slightly inrolled lateral margins, ca. 0.6 mm long, glabrous to densely papillate inside; gynostegium 1.8-2.2 mm high, the column densely papillate, the head 2.4-2.7 mm in diameter, slightly umbonate. Follicles (described from Cuban material) ovate-oblong, smooth, 15-21 cm long, 7-10 cm in diameter.
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Habit
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vines
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Distribution
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occurs in Cuba, Panama, Colombia and Mexico.
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Note
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The subgenus Metalepis is a highly variable and difficult group. As treated here, those plants having calyx lobes equal to or shorter than the corolla lobes are considered as C. cubense. I recognize two additional taxa, C. albiflorum (Urb.) Woodson (Colombia, Venezuela, Ecuador, Peru) and C. haughtii Wood- son (Ecuador), both of which have sepals longer than the petals.
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Specimen
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CANAL ZONE: Barro Colorado Island, Croat 11175, 12581 (both MO); Hayden 125 (DUKE, MO). COCLE': El Cermefio, Zetek 4528 (MO). PANAMIA: Isla de Pedro Gonzales, Dwyer 1697 (MO).
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