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This genus is accepted, and its native range is Cosmopolitan.

[FSOM]

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

Morphology General Habit
Perennial creeping herbs
Morphology Leaves
Leaves simple, sometimes peltate, with undivided and crenate to ± deeply palmately divided blade, with membranous stipules
Morphology Reproductive morphology Inflorescences
Inflorescence a simple umbel or of 2 or more superposed whorls, axillary, pedunculate; bracts small
Morphology Reproductive morphology Flowers
Flowers bisexual. Calyx-lobes minute or obsolete
Morphology Reproductive morphology Flowers Corolla
Petals small
Morphology Reproductive morphology Fruits
Fruits strongly laterally compressed, with narrow commissure; ribs usually prominent; endocarp woody; vittae absent or present only in primary ribs; stylopodia obsolete.
Distribution
Some 160 species in both tropical and temperate parts of the Old and the New World.

[FTEA]

Umbelliferae, C.C. Townsend. Flora of Tropical East Africa. 1989

Morphology General Habit
Creeping perennial herbs of wet places, rooting at the lower nodes, glabrous or ± hairy
Morphology Leaves
Leaves on slender petioles, sometimes peltate, undivided and crenate to deeply palmatisect, with membranous stipules
Morphology Reproductive morphology Inflorescences
Inflorescence a simple (sometimes ± capitate) umbel, a proliferous umbel, or of 2 or more superposed whorls, pedunculate, the peduncle long or short, axillary; bracts small, membranous; the very short or longer pedicels sometimes subtended by small bracteoles, at least in the lower flowers
Morphology Reproductive morphology Flowers
Flowers hermaphrodite
Morphology Reproductive morphology Flowers Calyx
Calyx-teeth very small or obsolete
Morphology Reproductive morphology Flowers Corolla
Petals small, white to greenish, not rarely ± suffused with purple
Morphology Reproductive morphology Fruits
Fruit strongly laterally compressed, the mericarps thin to somewhat thicker but the commissure always narrow; ribs filiform but usually ± prominent, particularly the dorsal; endocarp woody, carpophore absent; vittae absent or present only in the primary ribs; styles usually slender, arising from the discoid apex of each mericarp, stylopodia obsolete.

[FZ]

Umbelliferae, J. F. M. Cannon. Flora Zambesiaca 4. 1978

Morphology General Habit
Creeping perennial, rooting at the nodes, glabrous or pubescent.
Morphology Leaves
Leaves on slender petioles, sometimes peltate.
Morphology Reproductive morphology Inflorescences
Inflorescence a simple umbel (sometimes almost capitate), a proliferous umbel or an interrupted spike.
Morphology Reproductive morphology Inflorescences Peduncles
Peduncle very short to longer than the subtending leaf.
Morphology Reproductive morphology Flowers
Flowers white to greenish-yellow, calyx teeth minute; stylopodium depressed (rarely conspicuous).
Morphology Reproductive morphology Fruits
Fruit strongly laterally compressed, dorsal surface often acute; ribs well developed; carpophore absent.
Morphology Reproductive morphology Seeds
Commissural face of the seed plane to convex. Seed cavity surrounded by strengthening cells.
Morphology Reproductive morphology Fruits Vittae
Vittae absent to well developed.

Native to:

Alabama, Albania, Andaman Is., Angola, Antipodean Is., Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Assam, Austria, Azores, Bahamas, Bangladesh, Belarus, Belgium, Belize, Bermuda, Bolivia, Borneo, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Burundi, California, Cameroon, Cape Provinces, Caprivi Strip, Chatham Is., Chile Central, Chile North, Chile South, China North-Central, China South-Central, China Southeast, Colombia, Congo, Connecticut, Corse, Costa Rica, Cuba, Czechoslovakia, Delaware, Denmark, District of Columbia, Dominican Republic, East Himalaya, Ecuador, El Salvador, Ethiopia, Falkland Is., Fiji, Florida, France, French Guiana, Galápagos, Gambia, Georgia, Germany, Great Britain, Greece, Guatemala, Guinea, Gulf of Guinea Is., Guyana, Hainan, Haiti, Honduras, Hungary, Illinois, India, Indiana, Iran, Ireland, Italy, Jamaica, Japan, Jawa, Kentucky, Kenya, Kermadec Is., Korea, Kuril Is., KwaZulu-Natal, Laos, Lebanon-Syria, Leeward Is., Lesser Sunda Is., Louisiana, Macquarie Is., Madagascar, Maine, Malawi, Malaya, Maluku, Marquesas, Maryland, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Morocco, Mozambique, Myanmar, Nansei-shoto, Nepal, Netherlands, Nevada, New Brunswick, New Guinea, New Hampshire, New Jersey, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Nicaragua, Nicobar Is., Norfolk Is., North Carolina, Northern Provinces, Northern Territory, Norway, Ogasawara-shoto, Ohio, Oklahoma, Ontario, Oregon, Pakistan, Palestine, Panamá, Paraguay, Pennsylvania, Peru, Philippines, Poland, Portugal, Puerto Rico, Queensland, Québec, Rhode I., Rwanda, Réunion, Sicilia, Solomon Is., Somalia, South Australia, South Carolina, Spain, Sri Lanka, Sudan, Sulawesi, Sumatera, Suriname, Sweden, Switzerland, Taiwan, Tanzania, Tasmania, Tennessee, Texas, Thailand, Tibet, Togo, Transcaucasus, Trinidad-Tobago, Tristan da Cunha, Uganda, Uruguay, Utah, Venezuela, Vermont, Victoria, Vietnam, Virginia, West Himalaya, West Virginia, Western Australia, Windward Is., Wisconsin, Yemen, Yugoslavia, Zambia, Zaïre, Zimbabwe

Extinct in:

Algeria

Introduced into:

Benin, Cabinda, Canary Is., Central American Pac, Chagos Archipelago, Eritrea, Gabon, Ghana, Hawaii, Ivory Coast, Krasnoyarsk, Lesotho, Liberia, Mauritius, Nigeria, North Caucasus, Rodrigues, Sardegna, Senegal, Swaziland, Turkey

Hydrocotyle Tourn. ex L. appears in other Kew resources:

First published in Sp. Pl.: 234 (1753)

Literature

Flora of West Tropical Africa

  • —F.T.A. 3: 3.

Flora Zambesiaca

  • Gen. Pl. ed. 5: 109 (1754).
  • Sp. Pl. 1: 234 (1753)

Flora of Somalia

  • Flora Somalia, Vol 2, (1999) Author: by M. Thulin [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • L., Gen. Pl., ed. 5: 109 (1754)
  • Sp. Pl.: 234 (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