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わだん (海菜)
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わが国の本州、関東地方南部から東海地方に分布しています。海岸の崖や岩場に生え、高さは３０〜６０センチになります。根茎は木質で、円形からへら形の葉が根生します。葉や茎を切ると白い乳液がでます。９月から１１月ごろ、「やくしそう（薬師草）」に似た黄色い花を咲かせます。１回だけの繁殖型で花が咲くと枯れます。和名の由来は不詳ですが、「海菜（わだつみな・わたな）」とよんでいたものが転訛したという説があります。ちなみに「わだつみ（海神）」は「海」の古語です。 |
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キク科アゼトウナ属の多年草で、学名は Crepidiastrum platyphyllum。英名はありません。 |
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The "Wadan" (Crepidiastrum platyphyllum) belongs to Asteraceae (the Aster family). It is a perennial herb that is distributed from the southern part of the Kanto region to the Tokai region in Honshu, Japan. It grows on coastal cliffs and rocks and can reach 30-60 cm in height. The rhizome is woody and has round to spatula-shaped leaves. When you cut the leaves and stems, you will get a white milky lotion. From September to November, yellow flowers resembling "Yakushi-so" come in bloom. It is a one-time breeding type and withers when it blooms. The origin of the Japanese name is unknown, but there is a theory that what was called "Wadatsumi-na" or "Wata-na" was transformed into "Wadan". By the way, "wadatsumi" is an old word for "sea". |
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愛知県南知多町「篠島」にて、2004年10月02日撮影。 |
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Shu Suehiro
shu@botanic.jp
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