A widespread Canthium species of upland northern Thailand, Laos, and China, known erroneously as C. parvifolium (described from India) or C. horridum (described from Java) is formally described as a new species Canthium obscurum. Aphotograph of fruiting twigs and line drawings of the flower are added. Canthium parvifolium is lectotypified by a herbarium specimen in P.

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Naturalis Biodiversity Center
doi.org/10.3767/blumea.2021.66.01.05
Blumea: Biodiversity, Evolution and Biogeography of Plants

de Wilde, W.J.J.O., & Duyfjes, B. (2021). Canthium obscurum W. J. de Wilde & Duyfjes, sp. nov., a new name for a widespread, wrongly interpreted species (Vanguerieae-Rubiaceae). Blumea: Biodiversity, Evolution and Biogeography of Plants, 66(1), 93–95. doi:10.3767/blumea.2021.66.01.05