Taxonomic revision of Ceropegia sect. Huernia (Asclepiadoideae, Apocynaceae) in Saudi Arabia with three new combinations
Alharbi SA, Al-Qthanin RN. PhytoKeys, March 2021.
Read the paper Free to read · doi:10.3897/phytokeys.174.58867
What this paper is about
A revision of the Huernia stem succulents of Saudi Arabia, in the same subfamily as milkweed, using 46 morphological characters and several clustering methods.
The authors reduce eleven reported species to four, with two more names dropped to varieties.
Summarised here from the abstract below. Not the authors’ words.
Abstract
This study provides a taxonomic revision for Ceropegia sect. Huernia in the flora of Saudi Arabia. Forty-six quantitative and qualitative morphological characters were analysed using principal component analysis (PCA), principal coordinates analysis (PCoA) and the unweighted pairs group using mean average (UPGMA) to separate and help delimit taxa. We propose to reduce the number of species reported in Saudi Arabia from 11 to four: C. khalidbinsultanii comb. nov., C. laevis, C. lodarensis and C. macrocarpa. This study also suggested reducing two names to varietal level under C. lodarensis (var. foetidacomb. nov. and var. rubrostictacomb. nov.). A key to the species, detailed morphological descriptions, illustrations, distribution maps, ecology, etymology and preliminary conservation assessments are provided that follow IUCN criteria.
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Milkweed USA. (2026). Taxonomic revision of Ceropegia sect. Huernia (Asclepiadoideae, Apocynaceae) in Saudi Arabia with three new combinations (listing). Retrieved DATE, from https://milkweedusa.com/research/taxonomic-revision-of-ceropegia-sect-huernia-asclepiadoideae-apocynaceae-in-2021/
"Taxonomic revision of Ceropegia sect. Huernia (Asclepiadoideae, Apocynaceae) in Saudi Arabia with three new combinations (listing)." Milkweed USA, 2026, https://milkweedusa.com/research/taxonomic-revision-of-ceropegia-sect-huernia-asclepiadoideae-apocynaceae-in-2021/. Accessed DATE.
Milkweed USA. "Taxonomic revision of Ceropegia sect. Huernia (Asclepiadoideae, Apocynaceae) in Saudi Arabia with three new combinations (listing)." Last modified 2026-08-01. Accessed DATE. https://milkweedusa.com/research/taxonomic-revision-of-ceropegia-sect-huernia-asclepiadoideae-apocynaceae-in-2021/.
@misc{milkweedusa_researchtaxonomicrevisionofc,
title = {Taxonomic revision of Ceropegia sect. Huernia (Asclepiadoideae, Apocynaceae) in Saudi Arabia with three new combinations (listing)},
author = {{Milkweed USA}},
year = {2026},
url = {https://milkweedusa.com/research/taxonomic-revision-of-ceropegia-sect-huernia-asclepiadoideae-apocynaceae-in-2021/},
note = {Accessed DATE}
}