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Project Name Data (Last Modified On 10/28/2012)
 

Flora Data (Last Modified On 10/28/2012)
Species DiosCOREA MACROSTACHYA Benth.
PlaceOfPublication Pl. Hartweg. 73. 1839.
Synonym Dioscorea Billbergiana Kunth, Enum. P1. 5:354. 1850. Dioscorea anconensis Knuth, in Fedde Repert. Sp. Nov. 28:82. 1930.
Description 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.
Distribution 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.
Note 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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