Goniothalamus ridleyi

It is a tree reaching 23 meters in height. Its papery to membranous, elliptical leaves are 14-29 by 3.5-11.4 centimeter, have short tapering tips and bases that come to a point where they meet the petioles. The dull upper surfaces of the leaves are hairless except the midribs which have fine hairs. The shiny lower surfaces are hairless except the midribs which have fine hairs. The leaves have about 6-19 pairs of secondary veins that emanate from their midribs that curve near the leaf margin. Its petioles are 6-16 by 1-3 millimeters and either hairless or sparse with fine hairs. Its flowers occur in crowded clusters on long pedicels that extend from warty outgrowths, or tubercle, that grow from the base of the trunk close to soil level. The tubercles are woody and covered in fine hairs. The sparsely hairy pedicels are 1.5-11 centimeters by 1.2-1.9 millimeters and have 3-10 small bracts. Its purple to brown, leathery, oval to triangular sepals are 9–1.35 by 6-9 millimeters, sparsely covered in fine hairs, with bluntly pointed tips. The sepals are fused at their base. Its flowers have 6 petals in two rows of 3. The cream-colored to pale brown, leathery, oblong to oval outer petals are 1.2-5 by 0.9-2 centimeters, have broad thick claws, come to shallow point at their tips. …

It has been observed growing in swamp forests, lowland forests and montane forests, on hillside or by streams, at elevations of 50 to 1000 meters.

== References ==