(Last Modified On 10/28/2012)
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(Last Modified On 10/28/2012)
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Species
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DiosCOREA MACROSTACHYA Benth.
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PlaceOfPublication
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Pl. Hartweg. 73. 1839.
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Synonym
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Dioscorea Billbergiana Kunth, Enum. P1. 5:354. 1850. Dioscorea anconensis Knuth, in Fedde Repert. Sp. Nov. 28:82. 1930.
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Description
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Stems climbing dextrorsely (at least in Panama specimens), glabrous, not winged, unarmed; leaves alternate; petioles slender, up to 5 cm. long, glabrous; leaf blades ovate, up to 11 cm. long and 7.5 cm. wide (or probably the lower larger), long-acuminate, cordate at base, entire, glabrous, not pellucid-lineolate, 9-nerved; staminate inflorescences usually solitary in an axil, simple or much- branched, 8-30 cm. long, the rhachis glabrous; flowers sessile, borne in small, stalked fascicles or rarely solitary; perianth segments purple, ovate, about 1 mm. long, glabrous; stamens 6, all fertile, borne on base of perianth segments, nearly sessile, extrorse; rudimentary ovary present; ovary glabrous; capsules coriaceous, obovate, 2.5-3 cm. long, 1.5-2 cm. wide, truncate at apex, glabrous, the angles sharp.
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Distribution
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Mexico to Panama. BOCAS DEL TORO: vicinity of Chiriqui Lagoon, von Wedel I223, I273, I488, I604, I760, I778. CANAL ZONE: Ancon Hill, Killip I2085 (TYPE of D. anconensis), 12056, Seibert 379; Chagres, Hayes 335, 336. COCLEf: Llano Bonito, north of Las Margaritas, Seibert 52I; between Las Margaritas and El Valle, Woodson, Allen & Seibert I732. PANAMA: sabanas north of Panama City, Paul 476.
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Note
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Knuth referred his species D. anconensis to subg. Helmia, sect. Dematostemon, but examination of an isotype shows definitely that the plant belongs in Eudios- corea and is synonymous with D. rncrostachya of sect. Apodostemon.
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