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

[FZ]

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

Morphology General Habit
Spiny succulent shrublet to c. 25 cm high, intricately branched from the base to form tangled heaps up to 1 m in diameter.
Morphology Branches
Branches to 30 cm long, 8–10 mm in diameter, obtusely 4-angled, pale green; angles shallowly sinuate with tubercles c. 10 mm apart along the margins.
Morphology General Spines
Spine shields 5–9 × 1.25–2 mm, decurrent and narrowing slightly but not reaching the flowering eye below, whitish-buff; spines slender, to 4 mm, occasionally obsolescent, widely diverging, usually deflexed; prickles usually slightly longer than the spines, to 5 mm long, c. 2 mm above the spines, divergent to form an X with the spines.
Morphology Leaves
Leaves c. 2 mm long, ovate-acute, caducous.
Morphology Reproductive morphology Inflorescences
Cymes solitary, simple; peduncles to 2.5 mm long, cyme branches to 3 mm long; bracts to 2.25 mm long, ovate, subacute.
Morphology Reproductive morphology Inflorescences Cyathia
Cyathia c. 3.5 × 5–6 mm with funnel-shaped involucres; glands c. 1.2 × 2.7 mm, transversely oblong, touching, dull orange, outer margin reddish; lobes c. 1.5 × 1.5 mm, fimbriate, bright magenta.
sex Male
Male flowers 10: bracteoles c. 3 mm long, filiform; stamens c. 5 mm long.
Morphology Reproductive morphology Flowers
Female flower: styles c. 3.5 mm long, free to the base, stigmas spreading, rugulose. Male flowers 10: bracteoles c. 3 mm long, filiform; stamens c. 5 mm long.
sex Female
Female flower: styles c. 3.5 mm long, free to the base, stigmas spreading, rugulose.
Morphology Reproductive morphology Fruits
Capsule and seeds not seen.

[FTEA]

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

Morphology General Habit
Succulent perennial densely branching from the base forming tangled masses ± 25 cm. high and 1 m. in diameter; branches decumbent to ± 50 cm. long, sparsely rebranched, sharply 4-angled, to ± 1 cm. thick, uniformly bright green; angles ± without teeth.
Morphology General Spines
Spinescence brown, the spine-pairs 5–15 mm. apart; spine-shields oblong-triangular, to 2–3 × 2 mm. above the spines, decurrent to 8 mm. and about halfway to 2 mm. above the flowering eye below; spines and prickles very slender, subequal in length or the prickles slightly longer, to 5 mm. long, spreading to form an ×.
Morphology Leaves
Leaves deltoid, ± 1 × 1 mm.
Morphology Reproductive morphology Inflorescences
Cymes solitary, 1-forked, with peduncles ± 2 mm. long; bracts ovate, ± 1.75 × 1.5 mm.
Morphology Reproductive morphology Inflorescences Cyathia
Cyathia ± 3 × 5 mm., with funnel-shaped involucres; glands transversely rectangular, ± 1.2 × 2.7 mm., contiguous, pinkish yellow; lobes transversely elliptic, 1 × 1.5 mm. red.
Morphology Reproductive morphology Flowers
Male flowers:bracteoles fan-shaped, dentate; mature stamens not seen. Female flower:ovary sessile; styles 4 mm. long, joined at the base, apices thickened.
sex Male
Male flowers:bracteoles fan-shaped, dentate; mature stamens not seen.
sex Female
Female flower:ovary sessile; styles 4 mm. long, joined at the base, apices thickened.
Morphology Reproductive morphology Fruits
Capsule and seeds not seen.
Habitat
On rocks in the shade of Brachystegia woodland; 990–1015 m.
Distribution
T8

Native to:

Malawi, Tanzania

Euphorbia isacantha Pax appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1990 Pawek, J. [11044], Malawi K000048576
Milne-Redhead, E. [8643], Tanzania 15764.000
Milne-Redhead, E. [8643A], Tanzania 25786.000
Milne-Redhead, E. [5643 B], Tanzania 26003.000
Milne-Redhead, E. [8643A], Tanzania 35045.000
Milne-Redhead, E. [8643A], Tanzania K000048959
Busse [949], Tanzania K000048960 Unknown type material

First published in Bot. Jahrb. Syst. 34: 82 (1904)

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

  • J.P.M. Brenan, Check-lists of the Forest Trees and Shrubs of the British Empire no. 5, part II, Tanganyika Territory p. 212 (1949).
  • N.E. Br. in Flora of Tropical Africa 6(1): 575 (1911).
  • Pax in A. Engler, Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 34: 82 (1904).

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