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わが国の本州、福島県以西から四国、九州、それに中国東部に分布しています。やや湿った林の中に生え、高さは5〜15センチになります。葉は三角状卵形で対生し、長い葉柄があります。5月から6月ごろ、青紫色の唇形の花を咲かせます。和名は、花が咲くすがたをうち寄せる波頭に準えたもの。
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シソ科タツナミソウ属の多年草で、学名は Scutellaria laeteviolacea。英名はありません。
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"Shisoba-tatsunami" (Scutellaria laeteviolacea) belongs to Lamiaceae (the Mint family). It is a perennial herb that is distributed from Fukushima prefecture of Honshu west to Shikoku, Kyushu in Japan, and eastern China. It grows in slightly damp forests and can reach 5 to 15 cm in height. The leaves are triangular ovate and opposite, with long petioles. The bluish-purple labiate flowers come in May to June. The Japanese name is likened to the wave front where the flowers bloom.
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大阪府四條畷市「むろいけ園地」にて、2002年06月02日撮影。
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