1. Family: Pontederiaceae Kunth
    1. Pontederia L.

      1. This genus is accepted, and its native range is Cosmopolitan.

    [FTEA]

    Pontederiaceae, B. Verdcourt. Flora of Tropical East Africa. 1968

    Habit
    Floating or creeping aquatic herbs, rooting at the nodes
    Leaves
    Leaves often of two sorts, the floating or erect ones broad, lanceolate, ovate or orbicular, the submerged ones linear; petioles long, sheathing at the base or sheath produced at apex to form a “stipule”
    Flowers
    Flowers solitary or in spikes or panicles arising from a convolute sheath-like spathe or bract, or fasciculate within the leaf-sheath
    Perianth
    Perianth funnel-shaped, slightly irregularly divided into 6 lobes, the inner broader than the outer
    Stamens
    Stamens 6, the 3 upper included, the 3 lower ± exserted, usually with longer filaments
    Pistil
    Ovary 3-locular; ovules numerous; style filiform; stigma entire or very shortly 3–6-lobed
    Fruits
    Capsule membranous, 3-locular, enclosed in the faded perianth, ovoid to linear-fusiform
    Seeds
    Seeds numerous, oblong or ellipsoidal, finely ribbed.
    [FTEA]

    Pontederiaceae, B. Verdcourt. Flora of Tropical East Africa. 1968

    Habit
    Erect glabrous usually perennial aquatic herbs, sometimes with stems arising from a stout creeping rhizome
    Leaves
    Leaves all radical with long petioles; flowering stems radical, each bearing one apical sheathing leaf, its petiole appearing as a prolongation of the stem
    Flowers
    Flowers medium-sized, blue, pedicellate, arranged in racemes (sometimes subumbelliform); the inflorescence is at first enclosed in a membranous spathe at the base of the peduncle, contained in the sheath of the apical leaf
    Perianth
    Perianth-lobes 6, free almost to the extreme base, the inner 3 broader, at first spreading, later twisted
    Stamens
    Stamens 6, fixed on the base of the perianth, equal or usually unequal, 5 with smaller yellow anthers, the sixth with a longer filament bearing an erect lateral tooth and having a longer blue anther
    Ovary
    Ovary 3-locular; ovules numerous
    Pistil
    Style filiform; stigma subentire or very shortly 3–6-fid
    Fruits
    Capsule loculicidally splitting into 3 valves
    Seeds
    Seeds oblong, longitudinally ribbed.

    Images

    Distribution

    Native to:

    Afghanistan, Alabama, Andaman Is., Angola, Argentina Northeast, Argentina Northwest, Arkansas, Assam, Bangladesh, Belize, Benin, Bolivia, Borneo, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Burkina, Cambodia, Caprivi Strip, Central African Repu, Chad, Chile Central, China North-Central, China South-Central, China Southeast, Colombia, Congo, Connecticut, Costa Rica, Cuba, Delaware, District of Columbia, Dominican Republic, East Himalaya, Ecuador, Egypt, El Salvador, Florida, French Guiana, Gabon, Gambia, Georgia, Ghana, Guatemala, Guinea, Guinea-Bissau, Guyana, Hainan, Honduras, Illinois, India, Indiana, Inner Mongolia, Iowa, Ivory Coast, Jamaica, Japan, Jawa, Kansas, Kentucky, Kenya, Khabarovsk, Korea, Krym, Laos, Lesser Sunda Is., Liberia, Louisiana, Madagascar, Maine, Malawi, Malaya, Mali, Maluku, Manchuria, Maryland, Masachusettes, Mexico Central, Mexico Gulf, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Mozambique, Myanmar, Namibia, Nansei-shoto, Nebraska, Nepal, New Brunswick, New Guinea, New Hampshire, New Jersey, New South Wales, New York, Nicaragua, Niger, Nigeria, North Carolina, North Caucasus, Northern Provinces, Northern Territory, Nova Scotia, Ohio, Oklahoma, Ontario, Pakistan, Panamá, Paraguay, Pennsylvania, Peru, Philippines, Primorye, Prince Edward I., Queensland, Québec, Rhode I., Rwanda, Senegal, Sierra Leone, South Carolina, South Dakota, Sri Lanka, Sudan, Sulawesi, Sumatera, Suriname, Tennessee, Texas, Thailand, Togo, Trinidad-Tobago, Uganda, Ukraine, Uruguay, Venezuela, Vermont, Vietnam, West Virginia, Western Australia, Wisconsin, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Arizona, Aruba, Azores, Bahamas, Bermuda, Burundi, California, Cameroon, Cape Provinces, Caroline Is., Cayman Is., Colorado, Cook Is., Corse, Czechoslovakia, Equatorial Guinea, Fiji, France, Free State, Haiti, Hawaii, Italy, KwaZulu-Natal, Lebanon-Syria, Leeward Is., Maldives, Marianas, Marshall Is., Mauritius, Mexico Northeast, Mexico Northwest, Nauru, Netherlands Antilles, New Caledonia, New Zealand North, Norfolk Is., Palestine, Portugal, Puerto Rico, Rodrigues, Réunion, Samoa, Sardegna, Society Is., Solomon Is., South Australia, South China Sea, Spain, Swaziland, Taiwan, Tanzania, Turkey, Vanuatu, Victoria, Virginia, Windward Is.

    Pontederia L. appears in other Kew resources:

    First published in Sp. Pl.: 288 (1753)

    Accepted by

    • Govaerts, R. (2004). World Checklist of Monocotyledons Database in ACCESS: 1-54382. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Sources

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

    Interactive Key to Seed Plants of Malesia and Indo-China
    The Malesian Key Group (2010) Interactive Key to Seed Plants of Malesia and Indo-China (Version 2.0, 28 Jul 2010) The Nationaal Herbarium Nederland Leiden and The Royal Botanic Gardens Kew

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. 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 2019. 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