Voyria pittieri (Standley) L. O. Williams

First description as Leiphaimos pittieri by Standley (1919). Transferred to Voyria by Williams (1968), accepted by Maas and Ruyters (1986). POWO calls this taxon being synonymous to Voyria flavescens, however, they follow two reference of which one (Plant Catalogue of Columbia) does not give any reasoning for the synonymization, the other (Checklist of the plants of the Guianas) even accepts Voyria pittieri as valid (on page 110). Anyhow, the differencens between the two species are striking, including the colour of the corolla being purple-blue to white in V. pittieri vs. yellow in V. flavescens (see Maas and Ruyters 1986).