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Based on morphological study and corroborated by unpublished molecular phylogenetic analyses, five grass species of high-mountain grasslands in Mexico, Central and South America,    Agrostis   bacillata   ,    A.   exserta   ,    A.   liebmannii   ,    A.   rosei   , and    A.   trichodes   , are transferred to    Podagrostis    and bring the number of species of this genus recognized in the New World to ten. The name    Apera   liebmannii    is lectotypified and epitypified. We provide an updated genus description for    Podagrostis   , and updated species descriptions, images, and notes on the new combinations. The diagnostic characteristics differentiating    Podagrostis    from    Agrostis    are: a) palea that reaches from (2/3) ¾ to almost the apex of the lemma; b) florets that usually almost equal the length of the glumes or are at least ¾ the length of the glumes; c) rachilla extension present and emerging from under the base of the palea as a slender short stub (rudimentary or up to 1.4 mm long, sometimes obscure in most florets in    P.   rosei   ), smooth or scaberulous, glabrous or distally pilulose (hairs &lt; 0.3 mm long); d) lemmas usually awnless, sometimes with a short straight awn 0.2–0.6 mm long, inserted medially or in the upper 1/3 of the lemma, not surpassing the glumes (awn well-developed, straight or geniculate and inserted in lower 1/3 of lemma, not or briefly surpassing glumes in    P.   rosei   ). We include a generic key to distinguish the species of    Podagrostis    from other similar genera in Latin America and a key to distinguish the species of    Podagrostis    now accepted as occurring in these areas.

New combinations and updated descriptions in Podagrostis ( Agrostidinae , Poaceae ) from the Neotropics and Mexico