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

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Habit
Herbs or subshrubs, with white latex
Leaves
Leaves alternate
Inflorescences
Capitula often in paniculate inflorescences; involucre cylindrical; receptacle naked
Fruits
Achenes flattened, distinctly beaked, usually with ribs; pappus of smooth or scabrid bristles.
Distribution
Over 100 species in Europe, Asia, Africa and North America, one widely cultivated.

[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.

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, Massachusetts, 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, Thailand, 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, Bangladesh, 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 Somalia

  • Flora Somalia, (2000) Author: by M. Thulin [updated by M. Thulin 2008]

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)

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Somalia
Flora of Somalia
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 2021. 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 2021. 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