King ex Rolfe 1892 - Hemsley WB (1892) Observations on a Botanical Collection made by Mr. A. E. Pratt in Western China, with Descriptions of some new Chinese Plants from various Collections. Journal of the Linnean Society of London, Botany 29(202): 298-322. doi: 10.1111/j.1095-8339.1892.tb02268.x.