1. Family: Podostemaceae Rich. ex Kunth
    1. Tristicha Thouars

      1. This genus is accepted, and is native to Asia-Tropical, Africa, Southern America and Northern America..

    [FTEA]

    Podostemaceae, H. J. Beentje, M.Sc., Ph.D., F.L.S.. Flora of Tropical East Africa. 2005

    Habit
    Annual or perennial herbs, freshwater aquatics, attached to rocks and stones in streams, rivers and near waterfalls; basal part thalloid, ribbon-like, branched, bearing short or long leafy shoots or abbreviated fertile shoots
    Leaves
    Leaves small, spaced along sterile branches, dense and imbricate on flowering branches, arranged in 3 ranks, sessile, entire or divided
    Inflorescences
    Flowering shoots subtended by 2 or more short leafy branches, surrounding a reduced stem terminated by the solitary flower
    Flowers
    Flower terminal and/or axillary, subtended by 2 scarious bracts longer than the leaves
    Perianth
    Perianth segments (tepals) 3, connate near base, scarious; stamen 1; ovary sessile, 3-locular, with 3 free filiform stigmas
    Fruits
    Fruit a ribbed capsule, septicidally 3-valved; seeds many, small.
    [FZ]

    Podostemaceae, C. Cusset. Flora Zambesiaca 9:2. 1997

    Habit
    Submerged, annual or perennial, freshwater herbs, firmly fixed to rock substrate in cataracts and spray at edges of waterfalls.
    Shoots
    Basal part thalloid, ribbon-like, branched, bearing moss-like shoots which vary greatly from abbreviated flowering shoots to long leafy stems.
    Inflorescences
    The abbreviated flowering shoots comprise 2 or more short leafy sterile branches which protect a greatly reduced stem terminated by a solitary flower; the long stems elongating in relation to the depth of submergence, freely branched producing leafy branchlets and short flowering shoots.
    Leaves
    Leaves small, ± spaced along the stems becoming closely imbricate on the branches and flowering shoots, arranged in 3 ranks (tristichous), sessile, entire or divided.
    Flowers
    Flowers terminal and/or axillary, each subtended by 2 scarious bracts longer than the leaves; spathella absent.
    Perianth
    Perianth segments (tepals) 3, joined for part of their length, scarious, usually ovate.
    Stamens
    Stamen 1.Ovary sessile, 3-locular, topped by 3 free linear styles.
    Fruits
    Capsule ovoid, ribbed, septicidally 3-valved; seeds small, numerous.

    Images

    Distribution

    Native to:

    Angola, Argentina Northeast, Belize, Bolivia, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Burkina, Cameroon, Cape Provinces, Caprivi Strip, Central African Repu, Chad, Colombia, Costa Rica, Cuba, Egypt, El Salvador, Ethiopia, French Guiana, Gabon, Ghana, Guatemala, Guinea, Gulf of Guinea Is., Guyana, Honduras, Ivory Coast, Kenya, KwaZulu-Natal, Liberia, Madagascar, Malawi, Malaya, Mali, Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Mozambique, Namibia, Nicaragua, Niger, Nigeria, Northern Provinces, Panamá, Paraguay, Rwanda, Sierra Leone, Sudan, Tanzania, Thailand, Togo, Uganda, Uruguay, Venezuela, Zambia, Zaïre, Zimbabwe

    Tristicha Thouars appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Peter, K. [21], Nigeria 35070.000
    Fleetwood, Tanzania 34810.000
    Taylor, G., Kenya 35263.000

    First published in Gen. Nov. Madagasc.: 3 (1806)

    Literature

    Flora of West Tropical Africa
    • Engl. in E. & P. Pflanzenfam. 18A: 35 (1930).
    • —F.T.A. 6, 1: 121
    Flora of Tropical East Africa
    • C. Cusset & G. Cusset in Bull. Mus. Nat. Hist. Nat. B, Adansonia 10, 2: 169 (1988)
    • Gen. Nov. Madagasc.: 3 (1806)

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.

    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/
    © 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/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0