Bartholina is a small genus of terrestrial orchids in the family Orchidaceae (order Asparagales), comprising just two species native to the southwestern tip of Africa. The genus is endemic to the Cape Floristic Region of South Africa and extends marginally into Namibia — a landscape dominated by the extraordinarily biodiverse Fynbos biome.
Plants in this genus are commonly called spider orchids, a name that captures the most striking feature of the flower: an elaborate fringe of long, narrow, spreading petal lobes that radiate outward in a pattern strongly suggestive of a spider's legs. This unusual floral architecture is characteristic of the genus and makes Bartholina immediately recognizable among southern African ground orchids.
Two species are recognized: Bartholina burmanniana (L.) Ker Gawl., which occurs in the Cape Province and is the more widely known of the two, and Bartholina etheliae Bolus, found in Namibia and the Cape Province.
The genus was named in honor of Thomas Bartholin (1616–1680), the seventeenth-century Danish anatomist and scientist celebrated for his work on the human lymphatic system.
Etymology
The genus name Bartholina commemorates Thomas Bartholin (1616–1680), a seventeenth-century Danish scientist and anatomist. The common name "spider orchid" derives from the flower's long, narrow, spreading petal lobes, which are said to resemble the legs of a spider.
Distribution
Bartholina is native to South Africa and Namibia. B. burmanniana is found in the Cape Province of South Africa, while B. etheliae occurs in both Namibia and the Cape Province. Both species are associated with the Fynbos plant kingdom of the Cape Floristic Region.
Ecology
Bartholina species grow as terrestrial orchids within the Fynbos biome, one of the world's most biodiverse floral kingdoms, centered on the southwestern Cape of South Africa. The distinctive spider-like floral morphology — long, fringe-like petal lobes — is characteristic of insect-pollinated orchids adapted to specialized pollinators.
