A new species of Sorghastrum (Poaceae) from Isla Socorro, Colima, Mexico |
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Authors: | Patricia Dávila Lidia I Cabrera Rafael Lira |
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Institution: | 1. Departamento de Botánica, Instituto de Biología, Universidad Autónoma de Mexico, Apartado Postal 70-367, 04510, México, D.F., México 2. Colegio de Postrraduados, Especialidad de Botánica, Mpio. Texcoco, Cod. Postal 56230, Estado de México, Mexico
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Abstract: | A new species ofSorghastrum,S. pohlianum, from Mexico is described and illustrated. A numerical analysis comparing the new species to the closest species (S. nutans andS. 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 fromS. 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 fromS. nudipes due to the presence of auricles > 1 mm long and inflorescence branches bearing spikelets along their entire length. |
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