1. Family: Araceae Juss.
    1. Genus: Wolffia Horkel ex Schleid
      1. Wolffia arrhiza (L.) Horkel ex Wimm.

        This species is accepted, and its native range is Africa, Europe to N. India, S. Korea to Philippines.

    [CATE]

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

    Diagnostic
    Fronds with 10-100 stomata, on the upper surface relatively deep green (not transparrent).
    Distribution
    Temperate, subtropical and tropical regions of Europe, Africa, western Asia and eastern Brazil with relatively mild winters and not very hot summers.
    General Description
    Fronds spherical to ellipsoid, with the greatest width just below the surface of the water, 0.5-1.5 mm long, 0.4-1.2 mm wide, 1-1 1/3 times as long as wide, 1 1/4-1 1/2 times as deep as wide, with 10-100 stomata, bright green on the surface (not transparent). INFLORESCENCE: Plants occasionally flowering and rarely fruiting. INFRUCTESCENCE: Seeds 0.4-0.5 mm long, about 0.4 mm thick.

    Images

    Distribution

    Native to:

    Algeria, Angola, Austria, Baltic States, Bangladesh, Belgium, Benin, Botswana, Bulgaria, Burundi, Canary Is., Cape Provinces, Central European Rus, Corse, Czechoslovakia, East European Russia, France, Free State, Germany, Ghana, Great Britain, Greece, Guinea-Bissau, Hungary, India, Iran, Italy, Ivory Coast, Kenya, Korea, KwaZulu-Natal, Lebanon-Syria, Madagascar, Morocco, Mozambique, Netherlands, Nigeria, North Caucasus, Northern Provinces, Palestine, Philippines, Portugal, Romania, Rwanda, Senegal, Sicilia, South European Russi, Spain, Taiwan, Tanzania, Togo, Transcaucasus, Uganda, Ukraine, West Himalaya, Yugoslavia, Zaïre

    Introduced into:

    Brazil Southeast, California, Nansei-shoto

    Wolffia arrhiza (L.) Horkel ex Wimm. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 1979 Richards [26355], Tanzania K000499396
    Kenya 42061.002
    South Africa 44231.000
    Milne-Redhead, E. [7237], Tanzania 24379.000
    Milne-Redhead, E. [11418], Kenya 33950.000
    Brenan, J.P.M. [8954], Nigeria 27132.000
    Brenan, J.P.M. [8596], Nigeria 27137.000
    Verdcourt, B. [290a], Tanzania 24381.000
    Drummond, R.B. [2975], Tanzania 18472.000
    Drummond, R.B. [4164], Kenya 23721.000
    Robson, N.K. [73], Zambia 1290.000
    Robson, N.K. [1325], Malawi 1291.000
    Richards, H.M. [8328], Zambia 1289.000
    Richards, H.M. [24609], Tanzania 3360.002
    Richards, H.M. [20227], Tanzania 34074.000
    Richards, H.M. [24868], Tanzania 3360.001
    Hepper, F.N. [3952], Cameroon 32691.001
    Hepper, F.N. [4667], Sri Lanka 33552.000
    Hepper, F.N. [4657], Sri Lanka 33554.002
    Townsend, C.C. [73/360], Pakistan 34995.000
    Shepherd, T. [CB1056], Ghana 24380.000
    Keay, R.W.G. [F.H.I. No 22], Nigeria 24970.000
    Hall, J.B. [3037], Ghana 24963.000
    Ake Assi, L., Côte d'Ivoire 29808.000
    Curtis, W.M., Australia 36895.000
    Ake Assi [10195], Côte d'Ivoire 31726.000
    Broadbent, J.A. [7], Nigeria 6049.081
    Broadbent, J.A. [31], Nigeria 6049.085
    Broadbent, J.A. [17], Nigeria 6049.096
    Broadbent, J.A. [23], Nigeria 6049.101

    First published in Fl. Schles., ed. 3: 140 (1857)

    Accepted by

    • Chang, C.S., Kim, H. & Chang, K.S. (2014). Provisional checklist of vascular plants for the Korea peninsula flora (KPF): 1-660. DESIGNPOST.
    • Seregin, A.P. (2014). Flora of Vladimir Oblast, Russia: grid data analysis: 1-441. KMK schientific press, Moscow.
    • Dimopoulos, P., Raus, T., Bergmeier, E., Constantinidis, T., Iatrou, G., Kokkini, S., Strid, A., & Tzanoudakis, D. (2013). Vascular plants of Greece. An annotated checklist: 1-372. Botanic gardens and botanical museum Berlin-Dahlem, Berlin and Hellenic botanical society, Athens.
    • Haigh, A. & Boyce, P.C. (2012). Flora Zambesiaca 12(1): 1-54. Royal Botanic Gardens, Kew.
    • Dobignard, D. & Chatelain, C. (2010). Index synonymique de la flore d'Afrique du nord 1: 1-455. Éditions des conservatoire et jardin botaniques, Genève.
    • Lejoy, J., Ndjele, M.-B. & Geerinck, D. (2010). Catalogue-flore des plantes vasculaires des districts de Kisangani et de la Tshopo (RD Congo) Taxonomania. Revue de Taxonomie et de Nomenclature Botaniques 30: 1-307.
    • Lejoly, J., Ndjele, L. & Geerinck, D. (2008). Flore de la Tshopo (RD Congo) Taxonomania. Revue de Taxonomie et de Nomenclature Botaniques 24: 1-37.
    • Castroviejo, S. & al. (eds.) (2008). Flora Iberica 18: 1-420. Real Jardín Botánico, CSIC, Madrid.
    • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
    • Catarino, L., Sampaio Martins, E., Pinto-Basto, M.F. & Diniz, M.A. (2006). Plantas Vasculares e Briófitos da Guiné-Bissau: 1-298. Instituto de investigação científica tropical, Instituto Português de apoio ao desenvolvimento.
    • Takhtajan, A.L. (ed.) (2006). Conspectus Florae Caucasi 2: 1-466. Editio Universitatis Petropolitanae.
    • 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.
    • Brunel, J.F., Hiepo, P. & Scholz, H. (eds.) (1984). Flore Analytique du Togo Phanérogames: 1-751. GTZ, Eschborn.

    Literature

    CATE Araceae
    • Landolt, E. 1986. The family of Lemnaceae - a monographic study, 1. Veröff. Geobot. Isnt. ETH (Stift. Rübel). 71: 1-563
    Kew Backbone Distributions
    • Chang, C.S., Kim, H. & Chang, K.S. (2014). Provisional checklist of vascular plants for the Korea peninsula flora (KPF): 1-660. DESIGNPOST.
    • Seregin, A.P. (2014). Flora of Vladimir Oblast, Russia: grid data analysis: 1-441. KMK schientific press, Moscow.
    • Dimopoulos, P., Raus, T., Bergmeier, E., Constantinidis, T., Iatrou, G., Kokkini, S., Strid, A., & Tzanoudakis, D. (2013). Vascular plants of Greece. An annotated checklist: 1-372. Botanic gardens and botanical museum Berlin-Dahlem, Berlin and Hellenic botanical society, Athens.
    • Dobignard, D. & Chatelain, C. (2010). Index synonymique de la flore d'Afrique du nord 1: 1-455. Éditions des conservatoire et jardin botaniques, Genève.
    • Lejoly, J., Ndjele, L. & Geerinck, D. (2008). Flore de la Tshopo (RD Congo) Taxonomania. Revue de Taxonomie et de Nomenclature Botaniques 24: 1-37.
    • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
    • Takhtajan, A.L. (ed.) (2006). Conspectus Florae Caucasi 2: 1-466. Editio Universitatis Petropolitanae.

    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

    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.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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/
    © 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