| Summary: | 碩士 === 國立臺灣師範大學 === 生命科學研究所 === 97 === The genus Agrostis Linneaus (Poaceae) in Taiwan is taxonomically revised base on morphological, phytogeographical and molecular phylogenetical studies. Occurence of lemma awn, callus vesture, and length of palea and anther are important characters for the classification of Taiwanese taxa. The Inflorescence and culm habit also provide useful application for distinguishing some taxa in Taiwan. In the study, Nine taxa in Taiwan were recognized, including A. arisan-montana Ohwi、A. avenaceae Gmel.、A. clavata Trin.、A. dimirpholemma Ohwi、A. fukuyamae Ohwi、A. infirma Buse、A. sonzanensis Hayata、Agrostis stolonifera L. and A. transmorrisonensis Hayata.
In a phylogenetic analysis based on the Chloroplast DNA sequence of the trnL-rpl32 intergenic spacer, 787 bps sequencing data was obtained. The topologies of maximum parsimony tree and neighbor-joining tree were similar. The phylogenetical relationships of Taiwanese taxa were conformed with great supported to the morphological differentiation. However, A. sozanensis Hayata was paraphyly. After observing morphology of vouchers again, A. transmorrisonensis Hayata was re-divided from A. sozanensis Hayata. Besides, A. arisan-montana Ohwi、A. fukuyamae Ohwi、A. infirma Buse and A. sonzanensis Hayata were not monophyly, it was not supported Veldkamp treatment to sorted the four taxa in a variety rank of a same species. For the former phylogenetic result, to restore the four taxa to original species ranks.
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