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A New Species of Sorghastrum (Poaceae) from Isla Socorro, Colima, Mexico

Patricia Dávila, Lidia I. Cabrera and Rafael Lira
Brittonia
Vol. 50, No. 3 (Jul. - Sep., 1998), pp. 301-308
Published by: Springer on behalf of the New York Botanical Garden Press
Stable URL: http://www.jstor.org/stable/2807773
Page Count: 8
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A New Species of Sorghastrum (Poaceae) from Isla Socorro, Colima, Mexico
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Abstract

A new species of Sorghastrum, S. pohlianum, from Mexico is described and illustrated. A numerical analysis comparing the new species to the closest species (S. nutans and S. nudipes) was undertaken. The first three principal components explain 84% of the variation of the taxa involved. In addition there is morphological evidence to distinguish the new species from its closest relatives. It differs from S. nutans by showing smaller inflorescences, having sterile lemmas and anthers, and having somewhat smaller but wider blades and different flowering periods. In addition, it is distinguished from S. nudipes due to the presence of auricles > 1 mm long and inflorescence branches bearing spikelets along their entire length.

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