L.P.Kvist & L.E.Skog 1992 - Kvist LP, Skog LE (1992) Novae Gesneriaceae Neotropicarum IV: Alloplectus purpureus and Columnea nematoloba-New Gesneriaceae from Northwestern South America. Brittonia 44(4): 475-480. doi: 10.2307/2807197.
There is no corrections for Columnea nematoloba yet.