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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.foetida   comb. nov.  and var.rubrosticta   comb. nov. ). A key to the species, detailed morphological descriptions, illustrations, distribution maps, ecology, etymology and preliminary conservation assessments are provided that follow IUCN criteria.

Taxonomic revision of Ceropegia sect. Huernia ( Asclepiadoideae , Apocynaceae ) in Saudi Arabia with three new combinations