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Phyiologia (April 1990) 68(4):255-259. HYMENOCALLIS PIMANA (AMARYLLIDACEAE): A NEW SPECIES FROM NORTHWESTERN MEXICO Joseph E. Laferriere Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721 U.S.A. ABSTRACT Hymenocallis pimana Laferriere ( Amaryllidaceae) is described as a new species from the States of Chihuahua and Sonora, Mexico. It is distinguished from the closely related H. gramtnifolia Greenm. by larger size, longer floral bracts (44-82 mm long), a slightly longer perigone tube (5-10 cm long) and a longer style (11-18 cm long). It is distinguished from H. sonorensxs Standi, and H. durangoensts T. Howard by a larger staminal cup (25-40 mm high and 25-50 mm broad) and narrower leaves (5-11 mm wide). KEY WORDS: Hymenocallis, Amaryllidaceae, Mexico, Chihuahua, Sonora. RESUMEN Hymenocallis pimana Laferriere (Amaryllidaceas) se describe come nueva especie de los Estados de Chihuahua y Sonora, Mexico. Se dis-tingue de su congenero mas cercano H. gramintfolia Greermi. por su tamano mas grande, sus bracteas florales mas largas (44-82 mm de largo), su tubo del perigonio mas largo (5-10 cm de largo), y su estilo mas largo (11-18 cm de largo). Se distingue de H. sonorensis Standi, y H. durangoensis T. Howard por su copa estaminal mas grande (25-40 mm de altura y 25-50 mm de ancha), y por sus hojas mas angostas (5-11 mm de ancho). The genus Hymenocallis is a group of approximately 70 species in the Amaryllidaceae, native to the warm regions of the Western Hemisphere. It is a rapidly evolving genus with new species being described rather frequently (Flory 1976, 1977; Raina k Khoshoo 1971). The Sierra Madre Occidental of the Mexican states of Chihuahua and Sonora is home to a previously undescribed species of this genus. The plant was discussed as '"'' Hym^enocallis ^5" by Bauml (1979) but the plant was not 255

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Hymenocallis pimana (Amaryllidaceae): A new species from northwestern Mexico

J E Laferriére
Phytologia 68: 255-259 (1990)

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