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

      1. This genus is accepted, and is native to Europe, Asia-Tropical, Africa, 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 or perennial herbs or subshrubs, rarely scandent
    Leaves
    Leaves alternate or in a rosette, variable from entire to pinnatisect, often spinulose, sometimes reduced
    Capitulum
    Capitula in various inflorescences, generally corymbose or paniculate; phyllaries unequal, in several series, the outermost smallest; receptacle epaleate, with ± fimbriate alveolae
    Florets
    Florets with anthers sagittate at base, auricles acute or shortly setaceous-acuminate; style branches long with conspicuous sweeping hairs
    Fruits
    Achenes lengthening after anthesis, flattened, usually ribbed, generally with a distinct beak; pappus of bristles.
    [FZ]

    Compositae, G. V. Pope. Flora Zambesiaca 6:1. 1992

    Habit
    Annual, perennial or biennial herbs, erect often scapigerous, sometimes scandent.
    Stem
    Stems mostly solitary and branched above, glabrous, crispate-pubescent or setulose, rarely spinescent.
    Leaves
    Leaves radical, or cauline and alternate, often auriculate-amplexicaul, undivided to deeply runcinate-pinnatisect, or rarely pinnately compound, margins entire or remotely denticulate to coarsely dentate, glabrous or crispate-pubescent to setulose, rarely spinose-setose on midribs beneath, often glaucous.
    Capitulum
    Capitula few to numerous, corymbose or thyrsoid-paniculate, sometimes solitary.
    Phyllaries
    Phyllaries 3–5-seriate, elongating in the fruiting stage.
    Receptacle
    Receptacle epaleate, alveolate; alveolae ± fimbriate.
    Corolla
    Corollas yellow whitish purplish or blue.
    Anthers
    Anthers sagittate at the base, auricles acute or shortly setaceous-acuminate.
    Style
    Style branches long with conspicuous sweeping hairs.
    Fruits
    Achenes homomorphic, ± ellipsoidal, ± compressed, apex constricted and produced as a distinct filamentous beak, or beak absent; achene body ribbed, minutely rugose-scabridulous, ascending-hispidulous; pappus several-seriate of uniform white or straw-coloured, barbellate setae, rarely with an outer ring of minute setae.

    Images

    Distribution

    Native to:

    Afghanistan, Alabama, Alaska, Albania, Alberta, Algeria, Altay, Amur, Angola, Arizona, Arkansas, Assam, Austria, Azores, Bahamas, Baleares, Baltic States, Belarus, Belgium, Benin, Borneo, British Columbia, Bulgaria, Burkina, Burundi, Buryatiya, California, Cameroon, Canary Is., Cape Provinces, Central African Repu, Central European Rus, Chad, China North-Central, China South-Central, China Southeast, Chita, Colorado, Congo, Connecticut, Corse, Cyprus, Czechoslovakia, Delaware, Denmark, District of Columbia, Dominican Republic, East Aegean Is., East European Russia, East Himalaya, Egypt, Eritrea, Ethiopia, Finland, Florida, France, Free State, Georgia, Germany, Ghana, Great Britain, Greece, Guatemala, Guinea, Gulf of Guinea Is., Hainan, Haiti, Hungary, Idaho, Illinois, India, Indiana, Inner Mongolia, Iowa, Iran, Iraq, Ireland, Irkutsk, Italy, Ivory Coast, Japan, Jawa, Kamchatka, Kansas, Kazakhstan, Kentucky, Kenya, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Kriti, Krym, Kuril Is., KwaZulu-Natal, Labrador, Laos, Lebanon-Syria, Lesotho, Lesser Sunda Is., Liberia, Libya, Louisiana, Madagascar, Madeira, Magadan, Maine, Malawi, Mali, Manchuria, Manitoba, Maryland, Masachusettes, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Mongolia, Montana, Morocco, Mozambique, Myanmar, Namibia, Nansei-shoto, Nebraska, Nepal, Netherlands, Nevada, New Brunswick, New Guinea, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, Nigeria, North Carolina, North Caucasus, North Dakota, North European Russi, Northern Provinces, Northwest European R, Northwest Territorie, Norway, Nova Scotia, Ohio, Oklahoma, Oman, Ontario, Oregon, Pakistan, Palestine, Pennsylvania, Philippines, Poland, Portugal, Primorye, Prince Edward I., Qinghai, Québec, Rhode I., Romania, Rwanda, Sakhalin, Sardegna, Saskatchewan, Saudi Arabia, Sicilia, Sierra Leone, Sinai, Somalia, South Carolina, South Dakota, South European Russi, Spain, Sudan, Swaziland, Sweden, Switzerland, Tadzhikistan, Taiwan, Tanzania, Tennessee, Texas, Tibet, Togo, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Tuva, Uganda, Ukraine, Utah, Uzbekistan, Vermont, Vietnam, Virginia, Washington, West Himalaya, West Siberia, West Virginia, Wisconsin, Wyoming, Xinjiang, Yakutskiya, Yemen, Yugoslavia, Yukon, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Antipodean Is., Argentina Northeast, Belize, Bolivia, Botswana, Brazil South, Cape Verde, Caroline Is., Colombia, Costa Rica, Cuba, Ecuador, El Salvador, Fiji, Gulf States, Hawaii, Honduras, Jamaica, Marianas, Marshall Is., Mauritania, Mauritius, New South Wales, New Zealand North, Nicaragua, Niue, Norfolk Is., Northern Territory, Panamá, Paraguay, Peru, Puerto Rico, Queensland, Réunion, Seychelles, South Australia, Tasmania, Trinidad-Tobago, Tristan da Cunha, Tubuai Is., Uruguay, Venezuela, Victoria, Wake I., Western Australia

    Lactuca L. appears in other Kew resources:

    First published in Sp. Pl.: 795 (1753)

    Accepted by

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

    Literature

    Flora of West Tropical Africa
    • —F.T.A. 3: 450.
    Flora Zambesiaca
    • C. Jeffrey in Kew Bull. 18: 436–457, figs. 2–8 (1966).
    • Gen. Pl., ed. 5: 348 (1754).
    • Sp. Pl. 2: 795 (1753)
    Flora of Tropical East Africa
    • K. Bremer, Asteraceae Clad. & Class.: 184 (1994)
    • C. Jeffrey in K.B. 18: 436 (1966)
    • L., Gen. Pl., ed. 5: 348 (1754)
    • Sp. Pl.: 795 (1753)

    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

    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