1. Family: Hydrocharitaceae Juss.
    1. Egeria Planch.

      1. This genus is accepted, and its native range is Brazil to NE. Argentina.

    [FTEA]

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

    Habit
    Dioecious, submerged, freshwater, perennial herbs
    Roots
    Roots simple, adventitious, without root-hairs, arising from nodes
    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
    Stipules
    Stipules 0
    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
    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
    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
    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
    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
    Fruits
    Fruit ovoid, smooth
    Seeds
    Seeds ellipsoid, covered in elongated or spine-like cells.

    Distribution

    Native to:

    Argentina Northeast, Bolivia, Brazil South, Brazil Southeast, Brazil West-Central, Paraguay, Uruguay

    Introduced into:

    Alabama, Algeria, Arkansas, Azores, Bangladesh, California, Cape Provinces, Chile Central, China Southeast, Colombia, Colorado, Costa Rica, Cuba, Czechoslovakia, Delaware, El Salvador, Florida, France, Free State, Georgia, Germany, Ghana, Great Britain, Hawaii, Illinois, Indiana, Italy, Jamaica, Kansas, Kentucky, Kenya, KwaZulu-Natal, Louisiana, Maryland, Masachusettes, Mexico Central, Mexico Northeast, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Netherlands, New Jersey, New Mexico, New York, New Zealand North, New Zealand South, Nicaragua, North Carolina, North Caucasus, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Society Is., South Carolina, Spain, Switzerland, Taiwan, Tennessee, Texas, Transcaucasus, Trinidad-Tobago, Turkey-in-Europe, Uganda, Venezuela, Vermont, Virginia, West Virginia, Windward Is.

    Egeria Planch. appears in other Kew resources:

    First published in Ann. Sci. Nat., Bot., sér. 3, 11: 79 (1849)

    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

    Flora of Tropical East Africa
    • Cook & Lüönd in Aquat. Bot. 19: 74 (1984)
    • H. St. John in Darwiniana 12: 293 (1961)
    • in Ann. Sci. Nat., sér. 3,11: 79 (1849)

    Sources

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

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    [B] © 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 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    [C] © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0