1. Family: Asteraceae Bercht. & J.Presl
    1. Xanthium L.

      1. This genus is accepted, and is native to Europe, Southern America, Northern America and Asia-Temperate..

    [FTEA]

    Compositae, H. Beentje, C. Jeffrey & D.J.N. Hind. Flora of Tropical East Africa. 2005

    Habit
    Annual herbs
    Leaves
    Leaves alternate
    Capitulum
    Capitula unisexual, monoecious, axillary or terminal, discoid
    Male
    Male capitula globose, many-flowered; involucre with few phyllaries; receptacle paleate; corolla subcylindric, 5-dentate; anthers with minute apical appendage; style undivided
    Flowers
    Female capitula beneath the male, 2-flowered; involucre connate, 2-beaked at apex and covered with hooked bristles; corolla absent; style bifid Male capitula globose, many-flowered; involucre with few phyllaries; receptacle paleate; corolla subcylindric, 5-dentate; anthers with minute apical appendage; style undivided
    Female
    Female capitula beneath the male, 2-flowered; involucre connate, 2-beaked at apex and covered with hooked bristles; corolla absent; style bifid
    Fruits
    Achenes enclosed in the hardened involucre; pappus absent.

    Images

    Distribution

    Native to:

    Alabama, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Baltic States, Bolivia, Brazil North, Brazil South, Brazil Southeast, California, Chile Central, Chile North, Chile South, Colombia, Colorado, Connecticut, Delaware, Ecuador, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Iran, Juan Fernández Is., Kansas, Kentucky, Lebanon-Syria, Maine, Maryland, Masachusettes, Mexico Northeast, Mexico Northwest, Mexico Southwest, Michigan, Mississippi, Missouri, Montana, Nebraska, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Northwest European R, Ohio, Ontario, Oregon, Palestine, Paraguay, Pennsylvania, Peru, Québec, Rhode I., Saskatchewan, South Carolina, Tennessee, Texas, Turkey, Uruguay, Utah, Virginia, Washington, West Virginia, Yugoslavia

    Introduced into:

    Afghanistan, Albania, Algeria, Austria, Azores, Baleares, Belarus, Belgium, Botswana, Bulgaria, Canary Is., Cape Provinces, China North-Central, China Southeast, Corse, Cyprus, Czechoslovakia, Denmark, East Aegean Is., East European Russia, Egypt, Eritrea, Ethiopia, Fiji, France, Free State, Germany, Great Britain, Greece, Gulf States, Hungary, India, Italy, Japan, Kazakhstan, Kirgizstan, Korea, Kriti, Krym, KwaZulu-Natal, Lesotho, Libya, Mauritius, Morocco, Namibia, Netherlands, New Caledonia, New South Wales, North Caucasus, Northern Provinces, Northern Territory, Poland, Portugal, Queensland, Rodrigues, Romania, Réunion, Sardegna, Saudi Arabia, Sicilia, Sinai, South Australia, South European Russi, Spain, Swaziland, Switzerland, Tadzhikistan, Tasmania, Transcaucasus, Tunisia, Turkey-in-Europe, Turkmenistan, Ukraine, Uzbekistan, Victoria, West Himalaya, Western Australia, Western Sahara, Yemen, Zimbabwe

    Xanthium L. appears in other Kew resources:

    First published in Sp. Pl. 2: 987 (1753)

    Accepted by

    • Roskov Y. & al. (eds.) (2018). Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.

    Literature

    Flora of Tropical East Africa
    • Sp. Pl.: 987 (1753)

    Sources

    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 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