はまぼう (浜朴・黄槿) [Index] [Back] わが国の本州、神奈川県以西の太平洋側から山口県、九州から奄美大島、それに韓国の済州島に分布しています。河口や内湾など、汽水域の潮間帯上部から潮上帯の砂地や砂泥地に生え、高さは１〜３メートルになります。幹は灰白色から淡褐色で滑らか、縦に浅く裂けます。よく分枝して、鬱蒼と茂ります。葉は円形に近いハート形で、やや厚く、縁に細かい鋸歯があります。葉の裏や細い枝には灰白色の細毛が密生します。７月から８月ごろ、直径７センチほどの黄色い花を咲かせます。花の中心は赤褐色をしています。果実は卵形の�刮ﾊで、中には黒褐色の種子が十数個ほどできます。 アオイ科フヨウ属の落葉低木で、学名は Hibiscus hamabo (syn. Talipariti hamabo)。英名は Hardy yellow hibiscus。 The Hardy yellow hibiscus (Hibiscus hamabo) belongs to Malvaceae (the Mallow family). It is a small deciduous tree that is distributed in Japan's Honshu, from Kanagawa Prefecture westward along the Pacific coast to Yamaguchi Prefecture, from Kyushu to Amami Oshima, and also on Jeju Island in South Korea. It grows in brackish water areas such as estuaries and inner bays, from the upper intertidal zone to the supratidal zone on sandy or sandy-muddy substrates, reaching heights of 1 to 3 m. The trunk is grayish-white to light brown, smooth, and shallowly fissured longitudinally. It branches profusely, forming dense thickets. The leaves are nearly circular, heart-shaped, somewhat thick, and have fine serrulate margins. The undersides of the leaves and the slender branches are densely covered with grayish-white fine hairs. From July to August, it blooms with yellow flowers about 7 cm in diameter. The center of the flower is reddish-brown. The fruit is an ovoid capsule containing about a dozen blackish-brown seeds. 神奈川県鎌倉市「大船植物園」にて、2025年10月10日撮影。 Shu Suehiro shu@botanic.jp