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(Last Modified On 10/26/2012)
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(Last Modified On 10/26/2012)
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Species
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DIosCOREA UROPHYLLA Hemsl.
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PlaceOfPublication
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Biol. Centr.-Amer. Bot. 3:361. 1884.
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Description
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Stems climbing sinistrorsely, glabrous, bearing spines at base of larger leaves; leaves often opposite or subopposite; petioles elon- gate, up to 8 cm. long, often nearly as long as blade, glabrous; leaf blades ovate, up to 9 cm. long and 7 cm. broad, acuminate, truncate at base, 9-nerved, glabrous, mem- branous, entire, conspicuously pellucid-lineo- late; staminate spikes 8-20 cm. long, 1-3 in an axil, unbranched or conspicuously branched, the rhachis glabrous; flowers soli- tary, sessile; perianth segments about 3 mm. long, connate at base about 0.7 mm., fleshy, glabrous; stamens 6, all fertile, inserted on perianth lobes, the filaments about 0.6 mm. long, the anthers about 0.5 mm. long, in- trorse; rudimentary ovary large; pistillate spikes solitary, axillary, 10-20 cm. long; capsules oblong, 23-30 mm. long, 13-16 mm. wide, coriaceous, tuberculate, especially near middle of valves; seeds about 2 cm. long (including wing) and 6 mm. wide, winged on lower end.
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Distribution
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Confined to Panama.
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Specimen
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CANAL ZONE: Fort Kobe Road, Woodson, Allen d Seibert I424; Miraflores Lake, G. White I72; Gamboa, Pittier 3705; Rio Chagres between Rio Pequeni and Rio Indio, Steyermark & Allen i6777a; Las Sabanas, Pittier 668o; Ancon Hill, Seibert 396, Green- man d Greenman 5I30; Corozal, Standley 27337; between Corozal and Ancon, Pittier 6772. COCLE: between Aguadulce and Anton, Woodson, Allen & Seibert I204. PANAMA: Panama City, Riley 144, Macbride 26ii; Sabana de Panama', Gervais I54; Punta Paitilla, Standley 26232; Rio Tapia, Juan Diaz Region, Maxon & Harvey 6697.
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Note
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As pointed out by me (Carn. Inst. Publ. 461:248. 1926), D. urophylla belongs to subgenus Helmia, sect. Chondrocarpa, and not to Eudioscorea, sect. Macro- gynodium, where it was placed by Knuth. It is undoubtedly the same as the plant reported from Panama by Knuth (Engl. Pflanzenr. IV. 43:84. 1924) as D. samydea var. corcovadensis Uline. D. urophylla is surely very close to the Brazilian D. samydea Griseb., and may be conspecific. The type is Hayes I90 from Panama.
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