Maxwell, Gard. Bull. Sing. 34, 1 (1981)
Latin for 'thick or coarse calyx'.
Possibly a synonym of Pternandra rostrata.
Understorey tree up to 17 m tall and 24 cm dbh. Stipules absent. Leaves
opposite, simple, tripli-veined, tertiary venation visible, glabrous to hairy
below. Flowers ca. 12 mm diameter, white-bluish, placed in axillary bundles or
solitary. Fruits ca. 10 mm diameter, blue-purple, berries.
In undisturbed mixed dipterocarp forests up to 900 m altitude. Usually on
hillsides and ridges with clay to sandy soils. In secondary forests usually
present as a pre-disturbance remnant tree.
Borneo (Sarawak, Brunei, Sabah, East-Kalimantan).
Borneo: Empulus, Okea, Puloh, Serih-serih, Siri-siri.