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The floristic inventory of the Sierra de Quila Natural Reserve, in western Mexico, resulted in the discovery of Polianthes quilae ( Polianthes subgen. Bravoa). The novelty is related to P. cernua and P. geminiflora var. clivicola but is distinguished by the erect lanceolate leaves, glauous inflorescence with 4-21 floral nodes, 0.9-2.1 cm long pedicels, tubular-ventricose and bicolorous perigone with ascending lobes, and filament insertion site 3-5 mm above ovary apex. Data on geographic distribution and ecology, phenology, and conservation status are presented. Lastly, a key to all species of Polianthes is provided. [ABSTRACT FROM AUTHOR]

The article discusses a study which described new species of Urochloa (U.) from Western Mexico, including U. olivacea and U. pauciflora. Particular focus is given to the characters of Urochloa and Brachiaria. It notes that U. olivacea is an annual plant rooting at the lower nodes. Its sheaths are also shorter or longer than the internodes. Whereas, U. pauciflora is an annual plant with shorter sheats and exposed nodes. Also included are data on distribution, phenology and etymology.