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This genus is accepted, and its native range is America.

[FTEA]

Hydrocharitaceae, David Simpson. Flora of Tropical East Africa. 1989

Morphology General Habit
Dioecious, submerged, freshwater, perennial herbs
Morphology Roots
Roots simple, adventitious, without root-hairs, arising from nodes
Morphology Stem
Stems elongate, stoloniferous or erect, terete, simple or branched from axils; branches 1 per axil, subtended at the base by 2, sessile, opposite, scale-like leaves
Morphology Leaves Stipules
Stipules 0
Morphology Leaves
Nodal scales 2–4 per leaf, ovoid to orbicular with entire margins All other leaves sessile, in whorls of 2–8, linear to lanceolate or narrowly oblong, shortly acuminate to subobtuse, patent, spreading or recurved, flaccid, somewhat translucent, with 1 apical spine; margins green or hyaline, serrulate to denticulate, the teeth usually patent; venation consisting of midrib only
Morphology Reproductive morphology Flowers
Flowers unisexual Female flower: sepals 3, ovate to suborbicular, obtuse or cucullate, reflexed; petals 3, widely elliptic to orbicular, rounded, spreading; staminodes 3, linear, papillose. Ovary of 3 carpels, ovoid, 1-locular, placentation parietal; ovules up to 9, orthotropous; perianth-tube filiform, carrying perianth to just above the water-surface; styles 3; stigmas 3, irregularly 2–4-lobed, linear, papillose on adaxial surface, with 2 weakly 3-lobed nectaries at their base Male flowers long-pedicellate, remaining attached to the plant at anthesis; sepals 3, ovate to suborbicular, obtuse or cucullate, usually reflexed at anthesis; petals 3, widely elliptic to orbicular, rounded, spreading; stamens 9, in whorls of 3, anthers erect, 4-thecous, latrorsely dehiscent; filaments flattened, club-shaped or linear, nectaries 3-lobed, the lateral lobes shorter to longer than the central lobe
sex Male
Male flowers long-pedicellate, remaining attached to the plant at anthesis; sepals 3, ovate to suborbicular, obtuse or cucullate, usually reflexed at anthesis; petals 3, widely elliptic to orbicular, rounded, spreading; stamens 9, in whorls of 3, anthers erect, 4-thecous, latrorsely dehiscent; filaments flattened, club-shaped or linear, nectaries 3-lobed, the lateral lobes shorter to longer than the central lobe Male spathe solitary in leaf-axil, sessile, narrowly ovoid, 2–5-flowered
Morphology Reproductive morphology Inflorescences
Female spathes 1(–2) in leaf-axil, sessile, narrowly ovoid, 1(–2)-flowered Male spathe solitary in leaf-axil, sessile, narrowly ovoid, 2–5-flowered
sex Female
Female spathes 1(–2) in leaf-axil, sessile, narrowly ovoid, 1(–2)-flowered Female flower: sepals 3, ovate to suborbicular, obtuse or cucullate, reflexed; petals 3, widely elliptic to orbicular, rounded, spreading; staminodes 3, linear, papillose. Ovary of 3 carpels, ovoid, 1-locular, placentation parietal; ovules up to 9, orthotropous; perianth-tube filiform, carrying perianth to just above the water-surface; styles 3; stigmas 3, irregularly 2–4-lobed, linear, papillose on adaxial surface, with 2 weakly 3-lobed nectaries at their base
Morphology Reproductive morphology Fruits
Fruit ovoid, smooth
Morphology Reproductive morphology Seeds
Seeds ellipsoid, covered in elongated or spine-like cells.

Native to:

Alabama, Alberta, Argentina Northeast, Argentina South, Arkansas, Bolivia, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, British Columbia, California, Chile Central, Chile South, Colombia, Colorado, Connecticut, Delaware, Ecuador, Florida, French Guiana, Guyana, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Paraguay, Pennsylvania, Peru, Québec, Rhode I., Saskatchewan, South Dakota, Suriname, Tennessee, Uruguay, Utah, Venezuela, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming

Introduced into:

Algeria, Austria, Azores, Baltic States, Bangladesh, Belarus, Belgium, Bulgaria, Buryatiya, Canary Is., Cape Provinces, Central European Rus, China Southeast, Costa Rica, Cuba, Czechoslovakia, Denmark, East European Russia, Egypt, El Salvador, Finland, France, Free State, Georgia, Germany, Ghana, Great Britain, Greece, Hawaii, Hungary, Ireland, Irkutsk, Italy, Jamaica, Japan, Kenya, Krasnoyarsk, Krym, KwaZulu-Natal, Louisiana, Mexico Central, Mexico Northeast, Mexico Southeast, Mexico Southwest, Mississippi, Morocco, Netherlands, New South Wales, New Zealand North, New Zealand South, Nicaragua, North Caucasus, North European Russi, Northwest European R, Norway, Palestine, Philippines, Poland, Portugal, Puerto Rico, Romania, Society Is., South Carolina, South European Russi, Spain, Sweden, Switzerland, Taiwan, Texas, Transcaucasus, Trinidad-Tobago, Turkey-in-Europe, Uganda, Ukraine, West Siberia, Windward Is., Yugoslavia

Elodea Michx. appears in other Kew resources:

First published in Fl. Bor.-Amer. 1: 20 (1803)

Accepted by

  • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

Literature

Catálogo de Plantas y Líquenes de Colombia

  • WCVP (2021). World Checklist of Vascular Plants, version 2.0. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://wcvp.science.kew.org/ Retrieved 28 April 2021

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0