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This species is accepted, and its native range is W. Tanzania to N. Zambia.
A specimen from Kew's Herbarium

[FZ]

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

Morphology General Habit
Spiny succulent subshrub to 1.5 m high, sparingly branched.
Morphology Branches
Branches 4-angled, c. 10 mm in diameter, bright green; angles with shallow tubercles to 15 mm apart along the margins.
Morphology General Spines
Spine shields c. 2 mm wide, narrowing and decurrent almost to the flowering eye below, pale grey; spines to 6 mm long; prickles to 1.5 mm long.
Morphology Leaves
Leaves c. 1.5 × 1.5 mm, deltoid, deciduous.
Morphology Reproductive morphology Inflorescences
Cymes solitary, simple, subsessile; bracts c. 1.5 × 1.5 mm, subquadrate.
Morphology Reproductive morphology Inflorescences Cyathia
Cyathia c. 2.5 × 5 mm, with cup-shaped involucres; glands c. 1 × 2.5 mm, transversely rectangular, touching, yellowish becoming red; lobes c. 1 × 1.5 mm, elliptic.
sex Male
Male flowers: bracteoles c. 2 mm long, denticulate; stamens c. 3 mm long.
Morphology Reproductive morphology Flowers
Female flower: styles 2.5 mm long, joined at the base, apices thickened. Male flowers: bracteoles c. 2 mm long, denticulate; stamens c. 3 mm long.
sex Female
Female flower: styles 2.5 mm long, joined at the base, apices thickened.
Morphology Reproductive morphology Fruits
Capsule c. 1.8 × 4.5 mm, obtusely lobed, ± sessile.
Morphology Reproductive morphology Seeds
Seeds 2.2 × 1.8 mm, ovoid, minutely verrucose, brown.

[FTEA]

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

Morphology General Habit
Shrubby succulent perennial, sparingly branched, erect to 1.5 m. high; branches 4-angled, ± 1 cm. thick, bright green; angles shallowly toothed with teeth to 1.5 cm. apart.
Morphology General Spines
Spinescence pale grey; spine-shields elongated, to ± 3 × 2 mm. above the spines, decurrent to shortly above the flowering eye below; spines to 6 mm. long; prickles to 1.5 mm. long.
Morphology Leaves
Leaves deltoid, ± 1.5 × 1.5 mm.
Morphology Reproductive morphology Inflorescences
Cymes solitary, subsessile, 1-forked; bracts subquadrate, ± 1.5 × 1.5 mm.
Morphology Reproductive morphology Inflorescences Cyathia
Cyathia ± 2.5 × 5 mm., with cup-shaped involucres; glands transversely rectangular, ± 1 × 2.5 mm., contiguous, yellowish becoming red; lobes transversely elliptic, ± 1 × 1.5 mm.
sex Male
Male flowers:bracteoles fan-shaped, dentate; stamens 3 mm. long.
Morphology Reproductive morphology Flowers
Female flower:styles 2.5 mm. long, joined at the base, apices thickened. Male flowers:bracteoles fan-shaped, dentate; stamens 3 mm. long.
sex Female
Female flower:styles 2.5 mm. long, joined at the base, apices thickened.
Morphology Reproductive morphology Fruits
Capsule sessile, obtusely 3-lobed, ± 2.8 × 4.5 mm.
Morphology Reproductive morphology Seeds
Seeds ovoid, 2.2 × 1.8 mm., brown, minutely tuberculate.
Habitat
Amongst rocks in river gorges, characteristically near waterfalls; 1200–1290 m.
Distribution
T4

Native to:

Tanzania, Zambia

Euphorbia cataractarum S.Carter appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Bullock, A.A. [1081], Tanzania K000253029 holotype

First published in Kew Bull. 42: 379 (1987)

Accepted by

  • 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

  • S. Carter in Kew Bulletin 42: 379 (1987).

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