1. Family: Araceae Juss.
    1. Wolffiella Hegelm.

      1. This genus is accepted, and its native range is America, Africa to Arabian Peninsula.

    [CATE]

    CATE Araceae, 17 Dec 2011. araceae.e-monocot.org

    Diagnostic
    Free floating aquatic plants, reduced to small, leaf-like, poorly differentiated fronds; roots and veins lacking, crystal cells lacking, seeds nearly smooth. Differs from Wolffia in having fronds flat, with air spaces, daughter fronds produced in a terminal flat pouch and flowers originating in a cavity at the side of the median line of the upper surface.
    General Description
    Fronds thin, orbicular oblong to linear or falcate; terminal pouche triangular and flat; frond with 1 layer of air spaces; flowers originating in a cavity (2 cavities in W. welwitschii) at the side of the median line of the upper surface of the frond. pistil with 1 atropous ovule.
    Distribution
    America, Africa.
    [FTEA]

    Lemnaceae, F. N. Hepper. Flora of Tropical East Africa. 1973

    Habit
    Small aquatic herb, submerged except for a portion of each thallus at water-level where a few stomata are present
    Thallus
    Thallus thin, undulate and falcate; daughter thallus budding from a flattened-conical pouch, sometimes forming a chain of several individuals in still water
    Roots
    Roots absent
    Flowers
    Flowers rarely produced in 2 pits at either side of mid-line on upper surface, 1 ♂ flower (with 1 stamen) and 1 ♀ flower occurring in each pit
    Pistil
    Style short; ovule 1, orthotropous
    Fruits
    Fruit with persistent style
    Seeds
    Seed spherical-turbinate; testa reticulate.
    [FTEA]

    Lemnaceae, F. N. Hepper. Flora of Tropical East Africa. 1973

    Habit
    Small aquatic herbs, floating on the surface of pools
    Thallus
    Daughter thallus budding from a symmetric pouch opening by a transverse slit with a longmembranous, ± widened median stipe on the underside Thallus flat, with air-spaces, upper surface provided with numerous stomata
    Flowers
    Flowers in a solitary lateral or almost median pit.

    Images

    Distribution

    Native to:

    Alabama, Angola, Argentina Northeast, Argentina Northwest, Argentina South, Arkansas, Benin, Bolivia, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, California, Cameroon, Cape Provinces, Central African Repu, Chad, Chile Central, Colombia, Costa Rica, Cuba, Delaware, District of Columbia, Dominican Republic, Ecuador, Egypt, El Salvador, Florida, French Guiana, Georgia, Ghana, Guatemala, Guyana, Haiti, Honduras, Illinois, Indiana, Jamaica, Kentucky, Kenya, KwaZulu-Natal, Leeward Is., Louisiana, Malawi, Mali, Masachusettes, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mississippi, Missouri, Mozambique, New Jersey, Nigeria, North Carolina, Ohio, Oklahoma, Panamá, Paraguay, Pennsylvania, Peru, Puerto Rico, Rwanda, Saudi Arabia, Senegal, South Carolina, Sudan, Suriname, Tanzania, Tennessee, Texas, Togo, Trinidad-Tobago, Uganda, Uruguay, Venezuela, Virginia, Washington, Windward Is., Zambia, Zaïre, Zimbabwe

    Introduced into:

    India

    Wolffiella Hegelm. appears in other Kew resources:

    First published in Bot. Jahrb. Syst. 21: 303 (1895)

    Accepted by

    • Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Flora of West Tropical Africa
    • Monod in Mém. Soc. Afr. Nord, Hors-Sér. 2: 229-242 (1949).
    • in Engl., Bot. Jahrb. 21: 303 (1895)
    CATE Araceae
    • Royal Botanic Gardens, Kew 2008. World Checklist of Selected Plant Families.
    • Landolt, E. 1998. Lemnaceae The Families and Genera of Flowering Plants.. 4: 264-270

    Sources

    CATE Araceae
    Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 17 Dec 2011.
    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

    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