A new species, Pentopetia lutea from dry southern Madagascar, is described, illustrated and compared to other species of the genus. The pollen, in tetrads, is also described.
KLACKENBERG J., CIVEYREL L., CIVEYREL L. & CIVEYREL L. 1997. — A new species of Pentopetia (Asclepiadaceae) from Madagascar. Adansonia 1997 (2): 267-271.