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わが国の北海道から本州・四国、それに千島列島に分布しています。亜高山帯の林内に生え、高さは20〜40センチになります。茎には4稜があり、直立します。葉は楕円形から長楕円形で4個が輪生します。6月から7月ごろ、上部の葉腋から集散花序をだし、小さな淡黄緑色の花を咲かせます。花冠の先は4裂します。
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アカネ科ヤエムグラ属の多年草で、学名は Galium kamtschaticum var. acutifolium。英名はありません。
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The "Oobano-yotsuba-mugura" (Galium kamtschaticum var. acutifolium) belongs to Rubiaceae (the Madder family). It is a perennial herb that is distributed to Hokkaido, Honshu and Shikoku of Japan, as well as the Kuril Islands. This herb grows in subalpine forests and can reach 20-40 cm in height. The stem is quadrangular and erect. The leaves are elliptic to oblong and four whorled. The cymes are borne on the upper axiles and bloom pale yelowish-green flowers from June to July. The corolla is four-lobate.
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[上・中1〜2] 岐阜県高山市奥飛騨温泉郷「西穂高岳」にて、2007年08月01日撮影。 [中3〜中5] 福島市土湯温泉町「浄土平」にて、2013年07月20日撮影。 [中6・下] 福島県磐梯町「磐梯山」にて、2016年07月09日撮影。
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