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This genus is accepted, and its native range is NE. & E. Tropical Africa, Angola to S. Africa, Subtropical Asia Australiasia, Easter Island, Peru to Chile.
Tetragonia tetragonoides

[FZ]

Tetragoniaceae, M. L. Gonçalves. Flora Zambesiaca 4. 1978

Morphology General Habit
Annual or perennial herbs or subshrubs, often minutely papillose.
Morphology Leaves
Leaves subsucculent.
Morphology Reproductive morphology Flowers
Flowers axillary, solitary or fasciculate, subsessile or pedunculate, greenish or yellowish.
Morphology Reproductive morphology Flowers Perianth
Perianth-segments united, the tube produced above the ovary, 3–5-lobed.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3–?, alternate with the perianth-segments, solitary or fasciculate.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary semi-inferior or inferior, (l)2–8(9)-locular, with 1 pendulous ovule per loculus and as many styles as the loculi, linear and free.
Morphology Reproductive morphology Fruits
Fruit hard, winged, horned or spiny.

[FSOM]

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

Distribution
A mainly Southern Hemisphere genus of 50–60 species, c. 40 in South Africa, the rest mostly in Australasia and western South America. A mainly Southern Hemisphere genus of 50–60 species, c. 40 in South Africa, the rest mostly in Australasia and western South America.
Morphology General Habit
Annual or perennial herbs or small shrubs, often minutely papillose Annual or perennial herbs or small shrubs, often minutely papillose
Morphology Leaves
Leaves alternate, slightly fleshy; stipules absent Leaves alternate, slightly fleshy; stipules absent
Morphology Reproductive morphology Flowers
Flowers axillary or terminal and becoming leaf-opposed, solitary or in clusters, bisexual or unisexual-Perianth (3–)4–5-lobed, closely surrounding ovary which is ± inferior Flowers axillary or terminal and becoming leaf-opposed, solitary or in clusters, bisexual or unisexual-Perianth (3–)4–5-lobed, closely surrounding ovary which is ± inferior
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens alternating with perianth lobes, solitary or many and in groups Stamens alternating with perianth lobes, solitary or many and in groups
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 1–9-celled; ovules 1 per cell; styles free, as many as cells, linear Ovary 1–9-celled; ovules 1 per cell; styles free, as many as cells, linear
Morphology Reproductive morphology Fruits
Fruit indehiscent, dry or succulent, with hard endocarp, sometimes with conspicuous wings, ridges or spines. Fruit indehiscent, dry or succulent, with hard endocarp, sometimes with conspicuous wings, ridges or spines.

[FTEA]

Aïzoaceae, C. Jeffrey. Flora of Tropical East Africa. 1961

Morphology General Habit
Often minutely papillose annual or perennial herbs or subshrubs
Morphology Leaves
Leaves alternate, entire, subsucculent
Morphology Leaves Stipules
Stipules absent
Morphology Reproductive morphology Flowers
Flowers axillary, solitary or fasciculate, sessile or pedunculate, hermaphrodite or unisexual, greenish or yellowish
Morphology Reproductive morphology Flowers Calyx
Calyx gamosepalous, the tube produced above the ovary, 3–5-lobed
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens few to many, alternate with the calyx-lobes, solitary or fasciculate
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary semi-inferior or inferior, 1–9-locular; ovules 1 perloculus, pendulous; styles as many as the loculi, linear, free
Morphology Reproductive morphology Fruits
Fruit simple, dry, hard, indehiscent, terete, winged, ridged, horned or spiny
Distribution
Probably some 60 species, of which about 40 are South African, the rest mostly Australasian and in western South America; 2 or 3 species in Somaliland and Socotra
Note
There is much to be said for treating this and the following genus as members of a separate family, the Tetragoniaceae, more closely allied to the Nyctaginaceae and Gyrostemonaceae; see Friedrich in Phyton 6: 220–263 (1956).

Native to:

Angola, Botswana, Cape Provinces, Chatham Is., Chile Central, Chile North, China South-Central, China Southeast, Ethiopia, Free State, Kenya, Kermadec Is., Korea, KwaZulu-Natal, Lesotho, Myanmar, Namibia, New Caledonia, New South Wales, New Zealand North, New Zealand South, Norfolk Is., Northern Provinces, Northern Territory, Ogasawara-shoto, Peru, Queensland, South Australia, Taiwan, Tasmania, Victoria, Vietnam, Western Australia

Introduced into:

Algeria, Argentina Northeast, Argentina Northwest, Ascension, Azores, Baleares, Bermuda, Bolivia, Brazil Northeast, Brazil South, Brazil Southeast, California, Canary Is., Cape Verde, Chile South, Connecticut, Costa Rica, Czechoslovakia, Denmark, Easter Is., Ecuador, Finland, Florida, Great Britain, Greece, Guatemala, Hawaii, Honduras, Italy, Jawa, Libya, Louisiana, Madeira, Massachusetts, Mauritius, Mexico Gulf, Mexico Northwest, Morocco, Mozambique, New York, North Carolina, Oregon, Palestine, Pennsylvania, Portugal, Rodrigues, Rwanda, Réunion, Somalia, Spain, St.Helena, Sumatera, Sweden, Tonga, Tubuai Is., Uganda, Uruguay, Uzbekistan, West Virginia, Wisconsin

Tetragonia L. appears in other Kew resources:

First published in Sp. Pl.: 480 (1753)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Flora Zambesiaca

  • Gen. Pl. ed. 5: 215 (1754).
  • Sp. Pl. 1: 480 (1753)

Flora of Somalia

  • Flora Somalia, Vol 1, (1993) Author: by M. G. Gilbert [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • Adamson, J. S. Afr. Bot. 21: 109 (1955)
  • L., Gen. Pl., ed. 5: 215 (1754)
  • Sp. Pl.: 480 (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