Glabrous. Leaves opposite; lamina narrowly ovate to ovate, 4—10(—13) by 1.5-4(-6) cm wide, cuneate to truncate at the base to a petiole 2-6 mm long, usually acuminate and acute or obtuse at the apex, lustrous above, dull below; venation pinnate with the midrib distinct above and prominent below and the main laterals usually obscure on both sides. Inflorescencess at the nodes, an umbel of usually 1 opposite pair of flowers; axis 0.5-6 mm long; pedicels 2-6 mm long; bracts triangular, acute, c. 1.5 mm long, connate only at the base and spreading as a shallow dish.
Asia-Tropical: Jawa (Jawa present); Malaya (Peninsular Malaysia present); Sumatera (Sumatera present), Thailand to Vietnam present
Thailand to Vietnam; Malesia: Sumatra, Peninsular Malaysia, Java.
Similar to Macrosolen bibracteolatus, differing in the bract and corolla characters described in the key. The species are sympatric only in eastern Indochina and northern Sumatra. Some specimens from these areas are difficult to discriminate, suggesting limited introgression.