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After critical study of type material and all available collections, the identity of Hoya wallichii (Wight) C.M.Burton as a species distinct from Hoya campanulata Blume is clarified. Hoya wallichii was previously considered to be endemic to Singapore but had become nationally extinct and consequently globally extinct. This study reveals, however, that it is also found in Peninsular Malaysia and Brunei and, even though it is still nationally extinct in Singapore, it is no longer globally extinct. Hoya campanulata is widespread and locally common in Sundaland but also nationally extinct in Singapore. The two species are fully described and illustrated by line drawings and colour photographs. Two conservation assessments are made, three names are lectotypified, and one name is epitypifed. This paper exemplifies how critical taxonomic understanding is fundamental to meaningful conservation assessments.

The taxonomic status of the presumed extinct Singaporean Hoya wallichii (Apocynaceae: Asclepiadoideae)