Specification :

Resembling an adenium with its spineless stems and caudex and large, glossy leaves, P. decaryi is somewhat unusual among pachypodiums. It also stands out for having the largest flowers in the genus, up to 4" in diameter, with asymmetrical petals, each resembling a broad knife-blade, to an inch wide, with one straight margin, the other curved. HBG 87260, ex A.Razafindratsira s.n., plants coll. Sept. 19, 1988, at Montagne des Franç ais, Diego Suarez, Madagascar.