Oliv. 1865 - Oliver P (1865) On the Lentibularieae collected in Angola by Dr. Welwitsch, A.L.S., with an Enumeration of the African Species. Journal of the Linnean Society of London, Botany 9(35): 144-156. doi: 10.1111/j.1095-8339.1865.tb00018.x.
There is no corrections for Utricularia welwitschii yet.