Resumo

RAMIREZ-AMEZCUA, Yocupitzia; TELLEZ, Oswaldo  e  STEINMANN, Victor Werner. A new and noteworthy species of Dioscorea (Dioscoreaceae) from Michoacán, Mexico. Bot. sci [online]. 2012, vol.90, n.4, pp.381-384. ISSN 2007-4476.

The new species Dioscorea megaphylla (Dioscoreaceae) is described and illustrated with photographs. It is known only from the type locality, along the coastal foothills of the Sierra de Coalcomán in the municipality of Aquila, Michoacán, Mexico, where it grows in rocky canyons and hillsides with tropical subdeciduous forest at elevations of 550-600 m.As the specific epithet suggest, this species is distinctive due to the size of its leaves, and these are the largest within the genus Dioscorea and measure as much as 60 cm long and 65 cm wide. Unlike most members of the genus, flowering occurs at the end of the dry season on newly produced stems before the leaves mature. Dioscorea megaphylla belongs to sect. Macrogynodium and is closely related to D. nelsonii and D. carpomaculata.

Palavras-chave : Disocorea; Mexico; section Macrogynodium.

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