Euphorbia williamsonii L.C. Leach

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Euphorbia williamsonii

Soil pockets on rocky outcrops
Ntumbachusi Falls
Mar 2019
Photo: Nick Wightman

Euphorbia williamsonii

Soil pockets on rocky outcrops
Ntumbachusi Falls
Mar 2019
Photo: Nick Wightman

Euphorbia williamsonii

Soil pockets on rocky outcrops
Ntumbachusi Falls
Mar 2019
Photo: Nick Wightman

Euphorbia williamsonii

Soil pockets on rocky outcrops
Ntumbachusi Falls
Mar 2019
Photo: Nick Wightman

Euphorbia williamsonii

Soil pockets on rocky outcrops
Ntumbachusi Falls
Mar 2019
Photo: Nick Wightman

Euphorbia williamsonii

Soil pockets on rocky outcrops
Ntumbachusi Falls
Mar 2019
Photo: Nick Wightman

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Species details: Click on each item to see an explanation of that item (Note: opens a new window)

Synonyms:
Common names:
Frequency: Locally common
Status: Native
Description:
Succulent shrub up to 1 m high branching from a partially exposed tuberous root; branched erect and rarely rebranching, acutely 3-angled, slightly constricted into variable shaped segments 2.5-5 x 2.5-5.25 cm, ┬▒obovate to subcircular; angles crenulated with tubercles to 18 mm apart along the margins, or further apart just above the constriction; spine shields ┬▒obovate, forming a ┬▒ continuous horny margin along the angles, 1-2.5 mm wide; spines to 1 cm long, diverging; prickles rudimentary; secondary rudimentary spines often flanking the flowering eye; leaves c. 2 x 1.5 mm, ovate, caduceus; cymes solitary, simple or reduced to single cyathia; peduncle 1.5-5.5 x 5.75 mm; bracts c. 2.5 x 5.5 mm, semicircular, blackish-red; cyathia to 3 x 5-7 mm with funnel-shaped involucres, bright red; glands 5(6), 1.5 x 2.5-4 mm, transversely elliptic, yellowish with reddish margin; lobes 1.5 x 2-2.5 mm, transversely oblong, finbriate, dark red; male flowers: c. 60: bracteoles numerous, fimbriate stamens c. 5.5 mm long; female flowers: styles stout, 2.5-3 mm long, spreading recurved, united at base, stigmas capitate; capsule to 5.5 x 9.5 mm, obtusely lobed, subsessile, shiny bright red; seeds c. 3.5 x 3 mm, subglobose, smooth, brown.
Type location:
Zambia, Kawambwa
Notes:
Derivation of specific name: williamsonii: named after Graham Williamson, who collected across Zambia and collected the type specimen together with Brain Simon.
Habitat: In fibrous mats on rocky quartzite outcrops.
Altitude range: 1150 m (approx)
Flowering time:Nov - Mar
Worldwide distribution: Only known from type locality at Ntumbachusi Falls in northern Zambia.
Zambian distribution (Flora Zambesiaca): N
Zambian distribution (Provinces): Lp
Growth form(s):
Endemic status: Endemic
Red data list status: Data deficient
Insects associated with this species:
Spot characters: Display spot characters for this species
Content last updated: Wednesday 10 April 2019
Literature:

Carter, S. & Leach, L.C. (2001). Euphorbiaceae: subfamily Euphorbioideae: tribe Euphorbieae Flora Zambesiaca 9(5) Pages 404 - 405.

Other sources of information about Euphorbia williamsonii:

External websites:

African Plants: A Photo Guide (Senckenberg): Euphorbia williamsonii
BHL (Biodiversity Heritage Library): Euphorbia williamsonii
EOL (Encyclopedia of Life): Euphorbia williamsonii
ePIC (electronic Plant Information Center): Euphorbia williamsonii
Flora Zambesiaca web site: Euphorbia williamsonii
GBIF (Global Biodiversity Information Facility): Euphorbia williamsonii
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network): Euphorbia williamsonii
iNaturalist: Euphorbia williamsonii
IPNI (International Plant Names Index): Euphorbia williamsonii
JSTOR Plant Science: Euphorbia williamsonii
Kew Herbarium catalogue: Euphorbia williamsonii
Mansfeld World Database of Agricultural and Horticultural Crops: Euphorbia williamsonii
Plants of the World Online: Euphorbia williamsonii
The Plant List (version 1.1): Euphorbia williamsonii
Tropicos: Euphorbia williamsonii
Wikipedia: Euphorbia williamsonii


Copyright: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-20

Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A. (2020). Flora of Zambia: Species information: Euphorbia williamsonii.
https://www.zambiaflora.com/speciesdata/species.php?species_id=206680, retrieved 10 August 2020

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