Goldblatt & J.C.Manning 1995 - Goldblatt P, Manning JC (1995) Phylogeny of the African Genera Anomatheca and Freesia (Iridaceae: Ixioideae), and a New Genus Xenoscapa. Systematic Botany 20: 161-178. doi: 10.2307/2419447.
There is no corrections for Xenoscapa uliginosa yet.