1. Family: Hydrocharitaceae Juss.
    1. Lagarosiphon Harv.

      1. This genus is accepted, and its native range is Tropical & S. Africa, Madagascar.

    [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, filiform to terete, simple or branched from axils; branches 1 per axil
    Leaves
    Leaves sessile, spirally arranged, subopposite or in whorls, linear to lanceolate, shortly acuminate to subobtuse, patent to strongly recurved, firm or flaccid, with 2 apical spines, often with 2 bands of sclerenchyma fibres on either side of midrib and 2–6 rows of submarginal sclerenchyma fibres; venation reduced to midrib only; margins green or hyaline, denticulate Nodal scales 2 per leaf, linear to widely ovate, with entire or papillose margins
    Stipules
    Stipules 0
    Flowers
    Flowers unisexual Female flower: sepals and petals 3, elliptic to ovate, obtuse or cucullate, usually reflexed at anthesis; staminodes 3, minute, linear; ovary 1-locular, placentation parietal; ovules 5–30, orthotropus; perianth-tube filiform, exerted laterally from the ovary near apex of the spathe, carrying perianth to the water surface; styles 3; stigmas 6, 2 per style, linear, papillose Male flowers shortly pedicellate, becoming detached and floating before anthesis; sepals and petals 3, oblong-ovate to ovate, obtuse or cucullate, usually reflexed at anthesis; stamens 3; anthers 4-thecous, fixed at right-angles to the filaments; filaments filiform, spreading horizontally; staminodes often present, 3, filiform, papillose, longer than the stamens, usually joined at the apex and functioning as a sail
    Male
    Male spathe solitary in leaf-axil, sessile, ovate to suborbicular, toothed, containing up to 40 flowers Male flowers shortly pedicellate, becoming detached and floating before anthesis; sepals and petals 3, oblong-ovate to ovate, obtuse or cucullate, usually reflexed at anthesis; stamens 3; anthers 4-thecous, fixed at right-angles to the filaments; filaments filiform, spreading horizontally; staminodes often present, 3, filiform, papillose, longer than the stamens, usually joined at the apex and functioning as a sail
    Inflorescences
    Female spathe solitary in leaf-axil, sessile, narrowly ovate to ovate, toothed, 1-flowered Male spathe solitary in leaf-axil, sessile, ovate to suborbicular, toothed, containing up to 40 flowers
    Female
    Female spathe solitary in leaf-axil, sessile, narrowly ovate to ovate, toothed, 1-flowered Female flower: sepals and petals 3, elliptic to ovate, obtuse or cucullate, usually reflexed at anthesis; staminodes 3, minute, linear; ovary 1-locular, placentation parietal; ovules 5–30, orthotropus; perianth-tube filiform, exerted laterally from the ovary near apex of the spathe, carrying perianth to the water surface; styles 3; stigmas 6, 2 per style, linear, papillose
    Fruits
    Fruit ovate, beaked at apex, pericarp smooth, irregularly dehiscent
    Seeds
    Seeds narrowly ellipsoid to ellipsoid, smooth, with short stipe at base, attenuate at apex.

    Images

    Distribution

    Native to:

    Angola, Botswana, Burkina, Cameroon, Cape Provinces, Caprivi Strip, Central African Repu, Chad, Ethiopia, Free State, Kenya, KwaZulu-Natal, Lesotho, Madagascar, Malawi, Mali, Mozambique, Namibia, Northern Provinces, Rwanda, Somalia, Sudan, Swaziland, Tanzania, Uganda, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Austria, Belgium, France, Germany, Great Britain, Ireland, Italy, Netherlands, New Zealand North, New Zealand South, Switzerland

    Recorded in error in:

    Ghana

    Lagarosiphon Harv. appears in other Kew resources:

    First published in J. Bot. (Hooker) 4: 230 (1841)

    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 West Tropical Africa
    • F.T.A. 7: 2.
    • in Hook., Journ. Bot. 4: 230 (1841)
    Flora of Tropical East Africa
    • Symoens & Triest in B.J.B.B. 53: 441 (1983)
    • Wright in F.T.A. 7: 3 (1897)
    • in Hook., Journ. Bot. 4: 230 (1841)

    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