Tosh & Robbr. (Oliv.) 2009 - Tosh J, Davis AP, Dessein S, Block PD, Huysmans S, Fay MF, Smets E, et al. (2009) Phylogeny of Tricalysia (Rubiaceae) and its Relationships with Allied Genera Based on Plastid DNA Data: Resurrection of the Genus Empogona 1. Annals of the Missouri Botanical Garden 96(1): 194-213. doi: 10.3417/2006202.
There is no corrections for Empogona ovalifolia var. glabrata yet.