Based on multivariate analyses, a new dioecious species of Poa from the Puneña and Altoandina phytogeographical provinces of Argentina is described. This species is most similar to Poa calchaquiensis of Poa section Dioicopoa. The ligule length, plant size, and glabrous pistillate anthoecia distinguish Poa nubensis. A key for identification and illustrations are also included.
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