For Georg Göran Wahlenberg (1780–1851), Swedish naturalist, geographer and doctor, who became a demonstrator in botany (1815–1828) and professor of botany at the University of Uppsala (1828–1851), succeeding Carl Peter Thunberg. Wahlenberg made his main work in the field of plant geography, and published, among other things the Flora Lapponica (1812), a considerably extended version of the work of his compatriot Linnaeus, who wrote a publication of the same name (1737). His other works were based on his trips to Norway, Finland and the plant world of northernmost Sweden. Wahlenberg was elected a member of the Royal Swedish Academy of Sciences in 1808.
Etymology of capensis:
From the Cape Province of South Africa, previously known as the Cape Colony. -ensis is a Latin adjectival suffix meaning “pertaining to or “originating in,” Thus these organisms were first discovered in the Cape. In the early days of exploration this epithet was frequently applied to anywhere in South Africa or even Southern Africa