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This genus is accepted, and its native range is Tropics & Subtropics.
Trianthema portulacastrum

[FSOM]

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

Distribution
About 20 species widely distributed in the tropics and subtropics, 10 endemic to Australia.
Morphology General Habit
Annual or short-lived perennial herbs (rarely ± shrubby)
Morphology Stem
Stems usually procumbent, becoming slightly woody at base
Morphology Leaves
Leaves opposite, those of a pair often unequal, petiolate or sessile, leaf-bases expanded and membranous, often fused together to form short sheath and with stipule-like lateral lobes
Morphology Reproductive morphology Flowers
Flowers 5-merous, in small dense cymes sometimes reduced to a single flower, subtended by scarious bracts, terminal bud soon overtopped by axillary shoot and thus apparently axillary, usually subsessile
Morphology Reproductive morphology Flowers Perianth
Perianth-tube free from ovary; tepals with petal-like inner face and usually a dorsal spur or mucro
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5–many, often alternating with tepals
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 1-celled, circumscissile, lid truncate or with central depression in African taxa.

[FTEA]

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

Morphology General Habit
Procumbent diffuse glabrous, papulose, or pubescent succulent mostly annual herbs
Morphology Leaves
Leaves opposite, those of a pair often unequal, linear to almost orbicular, entire, petiolate or sessile Leaf-bases membranous-dilated, often connate in pairs and with small stipuliform lobes
Morphology Reproductive morphology Flowers
Flowers axillary, solitary, fascicled or glomerulate, free or connate, sessile or stalked
Morphology Reproductive morphology Flowers Calyx
Calyx gamosepalous, 5-lobed; lobes usually with a distinct subapical dorsal mucro
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5-many, episepalous, when definite alternate with the calyx-lobes
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary of one carpel, unilocular, apex truncate or depressed around the style; ovules and seeds 2-many; placentation parietal.

[FZ]

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

Morphology General Habit
Prostrate, procumbent, ascending or erect, glabrous, papillose or pubescent, succulent, mostly annual herbs; stems with long often unequal internodes.
Morphology Leaves
Leaves opposite, those of a pair often unequal, linear to almost orbicular, entire, petiolate or sessile; leaf-bases membranous, dilated, often connate in pairs and with small stipuliform lobes.
Morphology Reproductive morphology Flowers
Flowers axillary, solitary or more often in groups, free or connate, ± sessile.
Morphology Reproductive morphology Flowers Perianth
Perianth segments distinctly united at base into a tube, the lobes ascending, mucronate behind the tip.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5–?, attached to the perianth, when definite alternate with the perianth lobes.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary of 1 carpel, 1-locular, with 2–? ovules; placentation parietal.
Morphology Reproductive morphology Fruits
Fruit circumscissile, enclosed by the perianth, the lid ± truncate, with thickened bands, the apex thin and often depressed.
Morphology Reproductive morphology Seeds
Seeds 2–?.

Native to:

Afghanistan, Aldabra, Angola, Argentina Northeast, Argentina Northwest, Arizona, Arkansas, Aruba, Bangladesh, Belize, Benin, Bolivia, Botswana, Burkina, California, Cambodia, Cameroon, Cape Provinces, Chad, China Southeast, Colombia, Comoros, Congo, Costa Rica, Cuba, Djibouti, Dominican Republic, Ecuador, Egypt, El Salvador, Eritrea, Ethiopia, Florida, Free State, Galápagos, Gambia, Georgia, Ghana, Guatemala, Guinea, Guinea-Bissau, Gulf States, Hainan, Haiti, Honduras, India, Iran, Ivory Coast, Jamaica, Jawa, Kenya, Leeward Is., Lesser Sunda Is., Louisiana, Malawi, Malaya, Mali, Maluku, Maryland, Mauritania, Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Mozambique, Myanmar, Namibia, Nepal, Netherlands Antilles, Nevada, New Guinea, New Jersey, New Mexico, New South Wales, Nicaragua, Niger, Nigeria, North Carolina, Northern Provinces, Northern Territory, Oklahoma, Oman, Pakistan, Panamá, Paraguay, Peru, Philippines, Puerto Rico, Queensland, Rodrigues, Réunion, Saudi Arabia, Senegal, Somalia, South Australia, South Carolina, South China Sea, Sri Lanka, Sudan, Sulawesi, Taiwan, Tanzania, Tennessee, Texas, Thailand, Togo, Trinidad-Tobago, Turks-Caicos Is., Uganda, Utah, Venezuela, Venezuelan Antilles, Victoria, Vietnam, Virginia, Western Australia, Windward Is., Yemen, Zaïre, Zimbabwe

Introduced into:

Alabama, Brazil Northeast, Colorado, Hawaii, Palestine, St.Helena

Trianthema L. appears in other Kew resources:

First published in Sp. Pl.: 223 (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 of West Tropical Africa

  • —F.T.A. 2: 587.

Flora Zambesiaca

  • Gen. Pl. ed. 5: 105(1754).
  • Sp. Pl. 1: 223(1753)

Flora of Somalia

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

Flora of Tropical East Africa

  • L., Gen. Pl., ed. 5: 105 (1754)
  • Sp. Pl.: 223 (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