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"Rebun-so" (Oxytropis megalantha) belongs to Fabaceae (the Pea family). It is a perennial herb that is endemic to Japan and is distributed only on Rishiri Island, Rebun Island, and the Shiretoko Peninsula in Hokkaido. This herb grows on dry grasslands along the coast and can reach 10 to 20 cm in height. White vellus hair grows throughout, the leaves are odd pinnate compound, with 8 to 11 pairs of leaflets. From June to July, 2-3 racemes are borne on the stem apex and bloom magenta butterfly-shaped flowers.
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