Taxonomic descriptions in English and Spanish, and keys to 16 closely related species of the Muhlenbergia montana (Nutt.) Hitchc. complex were generated by means of DELTA programs, using morphological character data from an automated taxonomic data bank. A chromatographic survey of the flavonoid content of 14 species produced 24 different flavonoids, of which 22 were chemically identified. The flavonoid profiles supported the morphological delimitation of the species and provided a basis for clearly separating the annual species (M. crispiseta and M. peruviana) from the perennial species in this complex. Two new perennial species (M. cualensis and M. michisensis) were described from populations which are morphologically and chemically distinct.

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