Tripogon debilis (Poaceae), a new species from western China

A new species of Tripogon from western China (Sichuan Province), T. debilis L. B. Cai, is described and illustrated. This species is similar to both T. chinensis (Franchet) Hackel and T sichuanicus S. M. Phillips & S. L. Chen, but distinguished from these two species by its pendent pi spikes, relatively tong glumes and lemma awns, denticulate upper glumes, and its paleas strikingly shorter than the lemmas.