Euphorbia venefica Trémaux ex Kotschy (Euphorbiaceae) and other shrub-like cylindrically stemmed Euphorbia with spirally arranged single spines
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Euphorbia venefica Trémaux ex Kotschy (Euphorbiaceae) and other shrub-like cylindrically stemmed Euphorbia with spirally arranged single spines. / Weber, Odile; Atinafe, Ergua ; Awas, Tesfaye ; Friis, Ib.
I: Societe des Naturalistes Luxembourgeois. Bulletin, Bind 122, 2020, s. 57-82.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Euphorbia venefica Trémaux ex Kotschy (Euphorbiaceae) and other shrub-like cylindrically stemmed Euphorbia with spirally arranged single spines
AU - Weber, Odile
AU - Atinafe, Ergua
AU - Awas, Tesfaye
AU - Friis, Ib
N1 - See about publication on https://www.snl.lu/publications-wp/bulletin-de-la-snl/ ISSN: 2716-750X (édition en ligne); 0304-9620 (édition imprimée) Les bulletins parus depuis 2011 ont été publiés sous la licence Creative commons CC BY-NC-ND 3.0 Luxembourg
PY - 2020
Y1 - 2020
N2 - On two independent field trips in 2015 and 2018, the authors collected a tall shrublike succulent species of Euphorbia (Euphorbiaceae) in Combretum-Terminalia woodland of the Omo Valley in south-western Ethiopia. These collections represent the easternmost records of E. venefica Trémaux ex Kotschy and are the first records from inside the borders of Ethiopia. Euphorbia venefica belongs to a group of large succulent species with single spines borne on a spine-shield and arranged on the cylindrical stem in a spiral. The species in this group are reviewed here, based on material in herbaria and the literature. The East African E. venefica and the West African E. unispina share potential distribution, have overlapping variation in stem- and leaf-morphology and cannot be separated by the characters mentioned in the literature. We consider these two taxa to be one species, to be called E. venefica and distributed from Burkina Faso to Ethiopia. E. poissonii presents characters that may justify it being a separate species restricted to Africa west of Cameroon. Euphorbiadarbandensis N.E. Br. and E. sapinii De Wild. are too poorly known and could not be placed. Conservation assessments suggest that neither E. venefica, nor E. poissonii are threatened.
AB - On two independent field trips in 2015 and 2018, the authors collected a tall shrublike succulent species of Euphorbia (Euphorbiaceae) in Combretum-Terminalia woodland of the Omo Valley in south-western Ethiopia. These collections represent the easternmost records of E. venefica Trémaux ex Kotschy and are the first records from inside the borders of Ethiopia. Euphorbia venefica belongs to a group of large succulent species with single spines borne on a spine-shield and arranged on the cylindrical stem in a spiral. The species in this group are reviewed here, based on material in herbaria and the literature. The East African E. venefica and the West African E. unispina share potential distribution, have overlapping variation in stem- and leaf-morphology and cannot be separated by the characters mentioned in the literature. We consider these two taxa to be one species, to be called E. venefica and distributed from Burkina Faso to Ethiopia. E. poissonii presents characters that may justify it being a separate species restricted to Africa west of Cameroon. Euphorbiadarbandensis N.E. Br. and E. sapinii De Wild. are too poorly known and could not be placed. Conservation assessments suggest that neither E. venefica, nor E. poissonii are threatened.
KW - Faculty of Science
KW - botany
KW - Africa
KW - Ethiopia
KW - environmental modelling
KW - nomenclatute
KW - Taxonomy
KW - biogeography
KW - Sudanian zone
KW - woodlands
KW - succulents
M3 - Journal article
VL - 122
SP - 57
EP - 82
JO - Societe des Naturalistes Luxembourgeois. Bulletin
JF - Societe des Naturalistes Luxembourgeois. Bulletin
SN - 0304-9620
ER -
ID: 244611655