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The "Iyo-kazura" (Cynanchum japonicum) belongs to Asclepiadaceae (the Milkweed family). It is a perennial herb that is distributed from Honshu to Shikoku, Kyushu in Japan, and the Korean Peninsula. It grows in coastal grasslands and is 30-80 cm tall. The stem is erect and usually unbranched. Pale yellowish-white flowers bloom in the upper leaf axils from May to July. The corolla is about 8 mm in diameter, with five lobes at the tip and five coronas around the gynostemium (connated by stamens and pistils) of the corolla. The fruit is a 4-6 cm long follicle.
In Korean, it's called "teong-gul-min-baek-mi-kkot" (덩굴민백미꽃). This is a compound word consisting of "vine" (teong-gul: 덩굴) + "min" (민) + "Bai wei" (paek-mi: 백미) + "flower" (kkot: 꽃). "Bai wei" is a herbal medicine used in traditional Chinese medicine, referring to the dried roots and rhizomes of "Cynanchum atratum". Also, unlike "Cynanchum atratum" the name "min" appears to have been given because its flowers are yellowish white.
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