A taxonomic revision of Acanthaceae tribe Barlerieae in Angola and Namibia. Part 2

Summary The second part of a taxonomic revision of the tribe Barlerieae (Acanthaceae) in Angola and Namibia covers Barleria sects. Somalia and Stellatohirta . Thirty-one taxa including 27 accepted species are treated. Four new species ( Barleria eburnea , B. imatensis , B. louiseana and B. thunbergiiflora ), one new subspecies ( B. kacondensis subsp. glabrescens ) and one new variety ( B. violascens var. humpatana ) are described. In addition, B. taitensis S.Moore var. occidentalis S.Moore is elevated to subspecies status and B. newtonii Lindau is resurrected as a distinct species endemic to the Lubango Highlands of Angola. Full descriptions, citations of types and representative specimens, and notes on their habitat(s), ecology and biogeography are provided for each taxon. Thirteen names in Barleria are lectotypified and a neotype is selected for B. newtonii . A preliminary assessment of the conservation status and extinction risk is provided for each taxon. Of the 31 taxa enumerated, five are assessed as Endangered, two as Vulnerable, two as Near Threatened, and 13 are of Least Concern, whilst nine are currently considered to be Data Deficient. This contribution completes our revision of Barleria in Angola and Namibia, with 59 accepted species, four additional subspecies, four additional varieties and two incompletely known taxa documented in total. A remarkable 75% of the taxa are endemic or near-endemic to Angola and Namibia.