To investigate the evolutionary relationships among species of Festuca s.l. we generated a nuclear ribosomal DNA ITS phylogeny recovering 10 strongly supported clades or genera: Drymochloa, Festuca, Leucopoa, Locajonoa, Lolium, Hesperochloa, Munnikopoa gen. nov., Pseudobromus, Valdesochloa gen. nov., and Xanthochloa. We make the necessary 51 new combinations in Drymochloa (D. muelleri, D. pseudeskia, D. scariosa), Festuca (F. albaredae, F. ambilobensis F. lima, F. membranacea subsp. fontqueriana), Hesperochloa (H. aloha, H. altaica, H. amplissima, H. argentina, H. bajacaliforniana, H. campestris, H. dasyclada, H. dichoclada, H. elmeri, H. extremiorientalis, H. hallii, H. hubsugulica, H. modesta, H. molokaiensis, H. nitidula, H. parvigluma, H. pulchella, H. pulchella ssp. jurana, H. quadridentata, H. sinensis, H. sororia, H. spectabilis, H. subulata, H. washingtonica) Leucopoa (L. komarovii), Locajonoa (L. patula), Lolium (L. simensis), Munnikopoa (M. scabra), Pseudobromus (P. brevisetus, P. killickii, P. longipes, P. mekiste), Valdesochloa (V. asperella, V. breviglumis, V. caldasii, V. chiriquensis, V. lugens, V. superba, V. venezuelana), and Xanthochloa (X. baetica, X. durandoi, X. paniculata, X. sclerophylla, X. spadicea); and provide a preliminary key to the genera. Lectotypes are designated for the names Festuca amplissima Rupr., F. costata var. breviseta Nees, F. dichoclada Pilg., F. longipes Stapf, F. modesta Nees, F. nitidula Stapf ex Hook. f., F. patula Desf., F. subulata var. japonica Hack., F. superba Parodi ex Türpe, and Micropyrum albaredae Paunero; and a neotype is designated for Triticum patens Brot.
Peterson et al. (Fri,) studied this question.
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