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わが国の八重山群島にある西表島の固有種です。低山地の常緑広葉樹林の林床に生え、高さは１０〜１５センチになります。葉は卵心形で表面は光沢のない暗緑色、白紋が入ることがあります。葉の裏面は帯紫色をしています。１月から４月ごろ、紫色の花を咲かせます。萼筒は円筒形で短く、開口部は狭くならなくて、三角状広卵形の萼裂片が３個つきます。雄しべは６個、花柱は３個で先端に角状突起があります。別名で「えくぼかんあおい（笑窪寒葵）」とも呼ばれます。
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ウマノスズクサ科カンアオイ属の常緑多年草で、学名は Asarum gelasinum (syn. Heterotropa gelasina)。英名はありません。
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The "Ekubo-saishin" (Asarum gelasinum) belongs to Aristolochiaceae (the Birthwort family). It is an evergreen perennial herb that is endemic to Iriomote Island in Japan's Yaeyama Islands. It grows on the forest floor of evergreen broad-leaved forests in low mountainous areas and reaches a height of 10 to 15 cm. The leaves are ovate-cordate, with a dull dark green upper surface that may feature white markings. The underside of the leaves has a purplish tint. It blooms with purple flowers from January to April. The calyx tube is short and cylindrical, with a wide opening, and bears three triangular-broad-ovate calyx lobes. It has 6 stamens and 3 styles, each with a horn-like projection at the tip. It is also known by the alternative name "Ekubo-kan-aoi".
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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。
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えくぼさいしん (笑窪細辛)
shu@botanic.jp