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わが国の本州、関東地方以西から四国・九州に分布しています。山地の木陰に生え、高さは40〜90センチになります。葉は長楕円形で縁には鋸歯があり、対生します。9月から10月ごろ、上部の葉腋から総状花序をだし、一方に偏って小さな白い花を咲かせます。名前は、初冬のころに茎の根元に霜柱のような氷柱をつくることから。
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シソ科シモバシラ属の多年草で、学名は Keiskea japonica。英名はありません。
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The "Shimo-bashira" (Keiskea japonica) belongs to Lamiaceae (the Mint family). It is a perennial herb that is native from Kanto district of Honshu west to Shikoku and Kyushu in Japan. This herb grows in mountainous tree-shaded areas, and it can reach 40-90 cm in height. The leaves are oblong with toothed edges and arranged in opposite. The racemes are borne in axils of upperpart of stems and bloom one-sideways the small white flowers from September to October. The Japanese name is derived from that the frost-column-like icicles are produced at the base of stems in early winter.
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[上・中1] 大阪市鶴見区「咲くやこの花館」にて、2005年09月07日撮影。 [中2〜中5] 東京都八王子市「高尾山」にて、2013年09月21日撮影。 [中6〜中9] 山梨県上野原市「扇山」にて、2013年09月22日撮影。 [中10・中11] 高知市五台山「牧野植物園」にて、2017年09月29日撮影。 [中12・下] 茨城県つくば市「つくば実験植物園」にて、2024年05月11日撮影。
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