あしぼそ (脚細) [Index] [Back] わが国の北海道南部から本州、四国・九州それに台湾や朝鮮半島、中国、東南アジアから中央アジアに分布しています。落葉樹林の林縁や湿った草地、谷沿いの道ばたなどに生え、高さは４０〜１００センチになります。茎は細くてよく分枝し、下部は地面を這って広がります。葉は披針形で長さ４〜１０センチ、先端は尖って、両面に白毛が密生します。９月から１０月ごろ、茎頂に総状花序をつけ、長さ４〜６センチの花序枝を１〜３個だします。花序軸の節ごとに長梗のある小穂と無梗の小穂が対になって２個ずつつきます。台湾華語では「柔枝莠竹」、中国語では「柔枝莠竹（rou zhi you zhu）」と呼ばれます。  イネ科アシボソ属の一年草で。学名は Microstegium vimineum。英名は Japanese stiltgrass、Chinese packing grass。  The Japanese stiltgrass (Microstegium vimineum) belongs to Poaceae (the Grass family). It is an annual herb that is distributed from southern Hokkaido to Honshu, Shikoku, Kyushu in Japan, as well as Taiwan, the Korean Peninsula, China, Southeast Asia, and Central Asia. It grows along the edges of deciduous forests, in moist grasslands, and along roadsides in valleys, and grows 40 to 100 cm tall. The stems are thin and well branched, with the lower part creeping and spreading on the ground. The leaves are lanceolate, 4-10 cm long, with pointed tips and densely covered with white hairs on both sides. From September to October, racemes are produced at the top of the stem, and one to three inflorescence branches, 4 to 6 cm long, are produced. At each node of the inflorescence axis, there are two pairs of spikelets, one with a long pedicel and the other without a pedicel. In Taiwanese Chinese, it is called "柔枝莠竹" and in Chinese, "柔枝莠竹" (rou zhi you zhu).  宮城県村田町関場「浮島の植物群落」にて、2024年08月22日撮影。  Shu Suehiro shu@botanic.jp