A new species of Acanthaceae (Ruellia saulensis) is described and illu
strated from French Guiana, and three new combinations (Justicia potar
ensis, J, flaviflora, and J. tobagensis) and one new name (Justicia co
ppenamensis) are proposed. The new species is compared to its closest
relative (Ruellia rubra), and a justification of the transfers is prov
ided.