ひめいよかずら (姫伊予蔓) [Index] [Back] わが国の奄美群島の沖永良部島と与論島、沖縄群島の沖縄島や阿嘉島、渡名喜島に分布しています。海岸近くの草地に生え、高さは２０〜４０センチになります。茎は直立します。葉は楕円形から卵形で、縁は全縁、対生します。４月から８月ごろ、上部の葉腋からやや短い花序を出し、淡黄色から黄褐色の花を咲かせます。花冠は５裂します。果実は広披針形の袋果です。環境省のレッドブックでは絶滅危惧ＩＢ類（ＥＮ）に指定されています。 ガガイモ科カモメヅル属の多年草で、学名は Cynanchum matsumurae (syn. Vincetoxicum matsumurae)。英名はありません。 The "Hime-iyo-kazura" (Cynanchum matsumurae) belongs to Asclepiadaceae (the Milkweed family). It is a perennial herb that is found on Okinoerabu Island and Yoron Island in the Amami Islands, as well as on Okinawa Island, Aka Island, and Tonaki Island in the Okinawa Islands. It grows in grassy areas near the coast and reaches a height of 20 to 40 cm. The stem is erect. The leaves are elliptical to ovate, with entire margins, and are arranged in opposite pairs. From around April to August, it produces slightly short inflorescences from the upper leaf axils, bearing pale yellow to yellowish-brown flowers. The corolla is 5-lobed. The fruit is a broadly lanceolate capsule. It is listed as Endangered (EN) in the Ministry of the Environment's Red List. 茨城県つくば市「つくば実験植物園」にて、2026年03月28日撮影。 Shu Suehiro shu@botanic.jp