Abstract
Cyanandrium Stapf, Brittenia Cogn., Enaulophyton van Steenis are the three pentamerous genera belonging to the tribe Sonerileae occurring in the Malaysian region. The other pentamerous genera Gravesia Naud., Calvoa Hook.f. and Amphiblemma Naud. are restricted to Madagascar and tropical Africa. The generic distinction is based on the nature of the connective and its appendages. In Cyanandrium the connective is dorsally inappendiculate and ventrally bilamellate, whereas in Enaulophyton the connective is provided with a spur dorsally and two thick auricles ventrally. In Brittenia the connective ends dorsally in a thick spur and ventrally in an ascendent appendage. Stapf (in Hook., Ic. P1. 25, t. 2419 (1895)) erected the genus Cyanandrium on the basis of Haviland's collections (Haviland 1549 &I42) from Borneo. It differs from Phyllagathis Blume in its pentamerous flowers and in the bilamellate ventral processes of the connective. So far two species Cyanandrium guttatum Stapf and C. rufum Stapf have been described. Two new species from Sarawak, C. jacobsianum Nayar and C. glabrum Nayar, are described here.
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