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''Egeria densa'' (syn. ''Anacharis densa'' (Planch.) Vict., ''Elodea densa'' (Planch.) Casp.; Large-flowered Waterweed or Brazilian Waterweed) is a species of ''Egeria'' native to warm temperate South America in southeastern Brazil, Argentina, and Uruguay.〔Germplasm Resources Information Network: (''Egeria densa'' )〕 It is an aquatic plant growing in water up to 4 m deep, with trailings stems to 2 m or more long, producing roots at intervals along the stem. The leaves are produced in whorls of four to eight, 1–4 cm long and 2–5 mm broad, with an acute apex. It is dioecious, with male and female flowers on separate plants; the flowers are 12–20 mm diameter, with three broad, rounded, white petals, 8–10 mm long on male plants, and 6–7 mm long on female plants.〔Flora of NW Europe: (''Egeria densa'' )〕〔Flora North America: (''Egeria densa'' )〕〔Jepson Flora: (''Egeria densa'' )〕〔Washington Department of Ecology: (''Egeria densa'' )〕 ==Cultivation and uses== ''Egeria densa'' is a popular aquarium plant, but is no longer sold in some areas due to its invasive potential. Plants in cultivation are all a male clone, reproducing vegetatively.〔〔 It grows well in the cooler aquarium and is suitable for the beginner. It is easily propagated by cuttings. According to reports (cf. Tropica link) it secretes antibiotic substances which can help prevent blue-green algae. It grows best in a nutrient-rich, high light situation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Egeria densa」の詳細全文を読む スポンサード リンク
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