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This species is accepted, and its native range is Ethiopia to Kenya.

[FTEA]

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

Morphology General Habit
Glabrous perennial herb with a thick tuberous rootstock to ± 12 × 4 cm. giving rise to several woody underground stems to ± 5 cm. long, which branch at ground-level; branches prostrate and leafy to 15 cm. long, or occasionally more floriferous and erect to 5 cm. high.
Morphology Leaves
Leaves broadly ovate to subcircular, to 17 × 13 mm., base rounded and obscurely oblique, apex rounded, margin entire, undersurface often tinged red; petiole to 1 mm. long; stipules broadly triangular to 0.8 × 0.6 mm., margin deeply toothed, sometimes joined at the base.
Morphology Reproductive morphology Inflorescences Cyathia
Cyathia solitary on peduncles to 4 mm. long, terminal and pseudoaxillary, 2 × 2 mm., with cup-shaped involucres; glands 4, transversely elliptic to 1 mm. wide, red with white entire or obscurely 2–3-lobed appendages to 0.75 × 1.5 mm.; involucral lobes triangular, 0.4 mm. long, shortly ciliate.
sex Male
Male flowers:bracteoles laciniate with ciliate apices; stamens 2 mm. long.
Morphology Reproductive morphology Flowers
Female flower:ovary pedicellate; styles 0.75 mm. long, suberect, bifid to halfway, with thickened apices. Male flowers:bracteoles laciniate with ciliate apices; stamens 2 mm. long.
sex Female
Female flower:ovary pedicellate; styles 0.75 mm. long, suberect, bifid to halfway, with thickened apices.
Morphology Reproductive morphology Fruits
Capsule exserted on a reflexed pedicel 5 mm. long, deeply 3-lobed, 2.25 × 2.25 mm.
Morphology Reproductive morphology Seeds
Seeds oblong-conical, 1.5 × 0.8 mm., pinkish buff and shallowly pitted.
Figures
Fig. 78/4, p. 422.
Habitat
Amongst grass in poor, often water-logged soil (black cotton or sandy); 725–1825 m.
Distribution
K4

Doubtfully present in:

Tanzania

Native to:

Ethiopia, Kenya, Somalia, Sudan

Euphorbia rivae Pax appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Bally, P.R.O. [7659], Kenya 16756.000

First published in Annuario Reale Ist. Bot. Roma 6: 186 (1897)

Accepted by

  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
  • 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.
  • Yang, Y., Riina, R., Morawetz, J.J., Haevermans, T., Aubriot, X. & Berry, P.E. (2012). Molecular phylogenetics and classification of Euphorbia subgenus Chamaesyce (Euphorbiaceae) Taxon 61: 764-789.

Literature

Kew Backbone Distributions

  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.

Flora of Tropical East Africa

  • A.D.Q. Agnew, Upland Kenya Wild Flowers p. 221 (1974).
  • Cufod., Enumeratio Plantarum Aethiopiae Spermatophyta (Supplement in Bull. Jard. Bot. Brux.) p. 456 (1958).
  • N.E. Br. in Flora of Tropical Africa 6(1): 505 (1911).
  • Pax in Ann. Ist. Bot. Roma 6: 186 (1897).

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens

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