Goniothalamus roseipetalus sp. nov. A flowering branch B flower C calyx of fused sepals (abaxial) D calyx of fused sepals (adaxial) E outer petal (abaxial) F outer petals (adaxial) G inner petal (abaxial). H inner petal (adaxial) I stamen (abaxial) J stamen (adaxial) K carpel (abaxial) L carpel (adaxial) M fruit, composed of separate monocarps. N–P seeds (different orientations). Drawn by A. Somphrom A–L from C. Leeratiwong 21–1708 (PSU) M–P from C. Leeratiwong 21–1707 (PSU).