なぜかんあおい (名瀬寒葵) [Index] [Back]

Asarum nazeanum

Asarum nazeanum

Asarum nazeanum

Asarum nazeanum

Asarum nazeanum

わが国の奄美群島にある奄美大島の固有種です。広葉常緑樹林下に生え、高さは5〜10センチになります。葉は卵形から卵状三角形で基部は心形、表面は暗緑色で光沢はなく、ふつう斑紋はありません。葉の裏面は淡緑色です。2月から3月ごろ、緑褐色の花を咲かせます。萼筒は杯形で上部は括れ、口環が発達していて、周囲には先の白色の小さな板状突起があります。雄しべは12個あって内外2列に並び、花柱は6個あって直立して先は短い角状の突起になります。環境省のレッドリストでは、絶滅危惧IA類(CR)に分類されています。
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 nazeanum。英名はありません。
The "Naze-kan-aoi" (Asarum nazeanum) belongs to Aristolochiaceae (the Birthwort family). It is a perennial herb that is endemic to Amami Oshima in Japan's Amami Islands. It grows under broad-leaved evergreen forests and reaches a height of 5 to 10 cm. The leaves are ovate to ovate-triangular with a cordate base; their upper surface is dark green, matte, and typically lacks mottling. The underside of the leaves is pale green. It blooms with greenish-brown flowers from around February to March. The calyx tube is cup-shaped and constricted at the top, with a well-developed ring around the mouth, surrounded by small, white, plate-like projections. There are 12 stamens arranged in two rows, inner and outer, and six styles that stand erect, ending in short, horn-like projections. It is classified as Critically Endangered (CR) on 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