ツクシスズメノカタビラ(イネ科)の特性と分布  [in Japanese] Identity and distribution of Poa crassinervis (Poaceae)  [in Japanese]

The taxonomic status of plants called Poa crassinervis HONDA (Fig. 1) was ambiguous, and it was sometimes suggested that the plants would be conspecific with Poa annua L. In order to clarify this taxonomic ambiguity, morphological features and ecological properties of plants referable to P. crassinervis were compared with those of P. annua on the basis of many new collections and field observations. it was confirmed that P. crassinervis can be recognized as different from P. annua in the architecture of panicles (Figs. 2-3), shape of second glume and lemma, and usually in the hairiness of nerves of lemma (Figs. 4-5). Habitats of these plants were quite similar. In their mixed colonies, plants with the intermediate morphological features were often found. The intermediates were highly sterile and were morphologically separable from both P. crassinervis and P. annua, and delimitations of these species were not obscured by the presence of the intermediates. A conclusion was drawn that "Poa crassinervis" may be a good species. A distribution map of this species was presented (Fig 6).