Eriocaulon

...an annual plant of the Eriocaulaceae family that grows in wetlands and rice fields (illustration). The leaves are linear, 3-8 cm long, and grow in clusters from the base of the plant, often submerged. In August and September, many flower stalks grow, each with a single white flower head at the end. The Japanese name comes from the star-like likeness of the flower head. The flower head is egg-shaped and spherical, about 4 mm in diameter. The bracts are shorter than the flowers. There are a few male flowers and many female flowers, all 1.5-2 mm long. In male flowers, the three outer perianths are fused together in a bract-like shape, leaving only the tips, and hold a corolla. The corolla is made up of three inner perianths fused together in a tubular shape, and has six stamens in the center. ...

*Some of the terminology explanations that mention "Eriocaulon" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…湿地や水田にはえるホシクサ科の一年草（イラスト）。葉は線形で長さ3～8cm，根際から多数束生し，しばしば沈水状態にある。8～9月に多数の花茎を伸ばし，先端に1個ずつ白色の頭花をつける。和名は頭花を星にみたてたものである。頭花は卵状球形で径約4mm。総苞片は花より短い。少数の雄花と多数の雌花がある。いずれも長さ1.5～2mm。雄花では3枚の外花被が先端だけを残して苞状に合着し，花冠を抱く。花冠は筒状に合着した3枚の内花被からなり，中央に6本のおしべがある。…

※「Eriocaulon」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報