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This species is accepted, and its native range is S. Tanzania to Namibia.
A specimen from Kew's Herbarium

[FZ]

Euphorbiaceae, S. Carter & L.C. Leach. Flora Zambesiaca 9:5. 2001

Morphology General Habit
Annual herb to 1 m high, stem often woody at the base, the whole plant sparsely covered with long spreading white hairs.
Morphology Leaves
Leaves with a petiole to 2.5 cm long; glandular stipules purplish; lamina to 11.5 × 3 cm, acute at the apex, cuneate at the base, subentire to serrate with minute gland-tipped teeth at the margin, midrib prominent on the lower surface.
Morphology Reproductive morphology Inflorescences
Cymes axillary and in 3-branched umbels forking up to 15 times and spreading horizontally, with primary rays to 12 cm long.
Morphology Reproductive morphology Inflorescences Bracts
Bracts subsessile, leaf-like, usually reflexed.
Morphology Reproductive morphology Inflorescences Cyathia
Cyathia sessile, 2.5 × 4 mm with cup-shaped involucres, pilose; glands 4, 1 × 1.5 mm, transversely elliptic, green becoming reddish-brown; lobes 0.7 mm in diameter, rounded, ciliate.
sex Male
Male flowers: bracteoles fan-shaped, feathery; stamens 2.5 mm long.
Morphology Reproductive morphology Flowers
Female flower: ovary densely hairy; styles 1 mm long, joined at the base, spreading, with thickened grooved apices. Male flowers: bracteoles fan-shaped, feathery; stamens 2.5 mm long.
sex Female
Female flower: ovary densely hairy; styles 1 mm long, joined at the base, spreading, with thickened grooved apices.
Morphology Reproductive morphology Fruits
Capsule barely exserted on a pilose pedicel c. 2 mm long, 4 × 5 mm, subglobose with truncate base, pilose with long spreading hairs.
Morphology Reproductive morphology Seeds
Seeds 3 × 2 mm, conical with an acute apex, 4-angled, surface with irregular warts in 3–4 horizontal ridges, brownish-black.

[FTEA]

Euphorbiaceae, A. R.-Smith. Flora of Tropical East Africa. 1987

Morphology General Habit
Annual herb to 1 m. high, stem often woody at the base, the whole plant sparsely covered with long spreading white hairs.
Morphology Leaves
Leaves ovate-lanceolate to lanceolate, to 10 × 3.5 cm., base cuneate, apex acute, margin subentire to serrate with minute gland-tipped teeth, midrib prominent on the lower surface; petiole to 5 cm. long; glandular stipules purplish.
Morphology Reproductive morphology Inflorescences
Cymes axillary and in terminal 3-branched umbels, with primary rays to 12 cm. long; bracts subsessile, usually reflexed.
Morphology Reproductive morphology Inflorescences Cyathia
Cyathia sessile, 2.5 × 4 mm., with cup-shaped involucres, pilose; glands 4, transversely elliptic, 1 × 1.5 mm., green, becoming reddish brown; lobes rounded, 0.7 mm. in diameter, ciliate.
sex Male
Male flowers:bracteoles fan-shaped, feathery; stamens 2.5 mm. long.
Morphology Reproductive morphology Flowers
Female flower:ovary densely hairy; styles 1 mm. long, joined at the base, spreading, thickened, with grooved apices. Male flowers:bracteoles fan-shaped, feathery; stamens 2.5 mm. long.
sex Female
Female flower:ovary densely hairy; styles 1 mm. long, joined at the base, spreading, thickened, with grooved apices.
Morphology Reproductive morphology Fruits
Capsule barely exserted on a pilose pedicel 2 mm. long, subglobose, with truncate base, 4 × 5 mm., pilose with long spreading hairs.
Morphology Reproductive morphology Seeds
Seeds conical, 4-angled, 3 × 2 mm. apex acute, brownish black, surface irregularly tubercled in 3–4 distinct (rarely obscure) horizontal ridges.
Habitat
Red sandy soil in grass amongst mixed dry scrub; 960–1750 mm.
Distribution
T7 T8

Native to:

Angola, Caprivi Strip, Malawi, Namibia, Tanzania, Zambia, Zimbabwe

Euphorbia benthamii Hiern appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Milne-Redhead, E. [8847], Tanzania 27332.000
Eyles, F. [8889], Zimbabwe 4082.000
Welwitsch [283 [943]], Angola K000253061

First published in Cat. Afr. Pl. 1: 943 (1900)

Accepted by

  • Bruyns, P.V. (2012). Nomenclature and typification of southern African species of Euphorbia Bothalia 42: 217-245.
  • Govaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew.

Literature

Flora of Tropical East Africa

  • Hiern in Cat. Afr. Pl. Welw. 1: 943 (1900).
  • N.E. Br. in Flora of Tropical Africa 6(1): 40 (1911).

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

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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