Northeastern Asian Flora
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Hydrilla verticillata (L.f.) Royle  
Family: Hydrocharitaceae
[Elodea verticillata (L.f.) F.Muell., moreHydora lithuanica (Rchb.) Besser, Hydrilla angustifolia Hassk., Hydrilla dentata Casp., Hydrilla dentata var. pomeranica (Rchb.) Casp., Hydrilla lithuanica (Rchb.) Dandy, Hydrilla najadifolia Zoll. & Moritzi, Hydrilla ovalifolia Rich., Hydrilla polysperma Blatt., Hydrilla roxburghii Steud., Hydrilla subulata Royle, Hydrilla verticillata var. brevifolia Casp., Hydrilla verticillata var. crispa Casp., Hydrilla verticillata var. roxburghii Casp., Hydrilla verticillata var. tenuis Casp., Hydrilla wightii Planch., Hydrospondylus submersus Hassk., Serpicula verticillata L.f., Serpicula verticillta L.f., Udora lithuanica Rchb., Udora occidentalis W.D.J.Koch, Udora pomeranica Rchb., Udora verticillata (L.f.) Spreng., Vallisneria verticillata (L.f.) Roxb.]
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  • Japan Flora
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Japan Flora: Stems elongate, loosely branch­ ing; leaves verticillate in 4s to 8s, narrowly lanceolate, spread­ing, 1-nerved, 1-2 cm. long, 1.5-2 mm: wide, serrate, acuminate and ending in a minute spine; pistillate flowers axillary; seeds 1-3, acute at both ends, 5-6 mm. long, short-cylindrical. Aug.-Oct Ponds.

Hokkaido (rare), Honshu, Shikoku, Kyu­shu; common. Eurasia, Malaysia, Australia, and Madagas­car.

Hydrilla verticillata
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Development supported by College of Agriculture and Life Sciences of Seoul
National University and Korea National Arboretum of Korea Forest Service.
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