Urceola is a genus of climbing and twining plants in the dogbane family Apocynaceae, placed in the order Gentianales. The genus was first described in 1798 and comprises around 21 accepted species. Members of Urceola are woody lianas or shrubs, characteristic of the Apocynaceae in bearing milky latex. The genus ranges across tropical and subtropical Asia, with species recorded from southern China (including Hainan, Yunnan, Guangdong, Guangxi, and Taiwan), the Himalayan foothills (Assam, Bhutan, Nepal), mainland Southeast Asia (Myanmar, Thailand, Laos, Cambodia, Vietnam), the Malay Peninsula, and the Indonesian archipelago as far east as New Guinea and the Philippines. One of the best-known species, Urceola elastica, has historically attracted attention as a latex-producing plant, illustrated in Köhler's Medizinal-Pflanzen in the nineteenth century. Other widely distributed species include Urceola rosea and Urceola micrantha, the latter spanning an especially broad range from the eastern Himalaya through southern China and across Southeast Asia.
Distribution
Urceola is native to tropical and subtropical Asia, with its range extending from southern China and the Himalayan foothills (including Assam, Bhutan, and Nepal) through mainland Southeast Asia, the Malay Peninsula, and the Indonesian archipelago to New Guinea and the Philippines. Individual species tend to have restricted distributions within this broad range, though Urceola micrantha is notably widespread across China, the eastern Himalaya, and continental Southeast Asia.
Taxonomy Notes
Urceola was first described as a genus in 1798 and belongs to the family Apocynaceae, order Gentianales. Several species previously placed in other Apocynaceae genera have been transferred to Urceola, as reflected in the many author citations in the species list (e.g., Urceola micrantha (Wall. ex G.Don) D.J.Middleton and Urceola rosea (Hook. & Arn.) D.J.Middleton). GBIF recognises the genus as accepted, with 7 species indexed in their backbone at time of retrieval; the Wikipedia species list records 21 currently accepted species.
