国产前原鹅观草的订正

对我国文献中记载的前原鹅观草（Ｒｏｅｇｎｅｒｉａｍａｙｅｂａｒａｎａ（Ｈｏｎｄａ）Ｏｈｗｉ）的标本和植物，与原产于日本的该种进行了比较形态学、细胞学研究，二者差异显著。作者认为我国所记载的该种种名应是山东鹅观草（Ｒｏｅｇｎｅｒｉａｓｈａｎｄｏｎｇｅｎｓｉｓ（Ｂ．Ｓａｌｏｍｏｎ）Ｊ．Ｌ．Ｙａｎｇ，Ｙ．Ｈ．ＺｈｏｕｅｔＹｅｎ），其内稃先端钝圆，长为外稃的３／４，染色体数为２ｎ＝４ｘ＝２８，具ＳＹ染色体组，结实率达９０％以上，过去被错定为Ｒ．ｍａｙｅｂａｒａｎａ。而Ｒ．ｍａｙｅｂａｒａｎａ在日本系一天然杂种，其内稃先端尖，与外稃等长或稍短，染色体数为２ｎ＝６ｘ＝４２，具ＨＳＹ染色体组，结实率极低，仅０．２％～０．４％。

A REVISION OF ROEGNERIA MAYEBARANA (HONDA) OHWI FROM CHINA

The specimens and fresh materials of Roegneria mayebarana (Honda) Ohwi recorded in some literatures in China were compared with the native specimens of R. mayebarana in Japan by means of comparative morphology and cytology in the present paper. They are quite different. The species which was previous misclassified as R. mayebarana (Honda) Ohwi in some Chinese literatures should be Roegneria shandongensis (B.Salomon) J. L. Yang, Y. H. Zhou et Yen. R. shandongensis has a obtus-rounded palea tip, is a tetraploid species (2n=28) and possesses the SY genomes. Its seed sets is more than 90%. However, R. mayebarana is a natural hybrid in Japan with acute palea tip, is a hexaploid species (2n=42), and has the HSY genomes. The seedsets is very low, only 0.2%～0.4%.