Wohlhauser, S. & M. W. Callmander (2012). Exacum albertigrimaldiiWohlh. & Callm. (Gentianaceae), a new species endemic to northern Madagascar. Candollea 67: 373–378. In English, English and French abstracts.
Exacum alberti-grimaldii Wohlh. & Callm. (Gentianaceae), a new species endemic to northern Madagascar, is described and illustrated. It resembles morphologically two other species: Exacum dolichantherum Klack. and Exacum nossibense Klack., also endemic to Madagascar. The three species have in common verticillated upper leaves and umbella-shape inflorescence. The new species can, however, be easily recognized by its smaller discrete petals and by the absence of wings on the sepals. It is known only from the Ampantsona river watershed in the Andrafiamena region in semi-decidous or sclerophyllous forests.