Abstract
Chusquea perotensis is described from Volcdn Cofre de Perote. Although its spikelets are typical of Chusquea, this species is anomalous in having the internodes hollow with well defined cavities. Based on molecular and morphological data, C. perotensis is classified within Chusquea sect. Swallenochloa, and is considered a sister species of C. bilimekii, also from Mexico. Both species are rare and probably threatened in their fragile montane habitats. Keys, based on vegetative only and vegetative and flowering characters, to the species of Chusqutea sect. Swallenochloa in Central America and Mexico are provided.
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