Monodora undulata is a species of plant in the family Annonaceae. It is native to Cameroon, the Central African Republic, Ghana, Guinea, Ivory Coast, Liberia, Nigeria and Sierra Leone. Palisot de Beauvois the botanist and entomologist who first formally described the species using the basionym Xylopia undulata, named it after the wavy (, in Latin) margins of its petals.
It is a tree reaching in height. Its mature leathery leaves are 10âÂÂ40 by 8âÂÂ13 centimeters and come to a point at their tips. The leaves are smooth on their upper and lower surfaces. Its petioles are 5âÂÂ10 millimeters long. Its pendulous flowers are solitary. Each flower is on a pedicel 30âÂÂ55 millimeters long. Its flowers have 3 oval-shaped sepals that are 7âÂÂ11 by 5âÂÂ10 millimeters. The sepals are green and smooth on both sides with wavy margins and are arched backwards when mature. Its 6 petals are arranged in two rows of 3. The outer petals are white with yellow and purple highlights, 3âÂÂ4.5 by 1.5âÂÂ3.0 centimeters, and have very wavy margins. The outer petals are smooth on both sides. The inner petals are yellow with purple spots with margins that touch one another. The inner petals have a 2.-5 millimeter wide claw at their base and a 2âÂÂ2.7 by 1.5âÂÂ2 centimeter blade. The inner petals are smooth on their outer surface, and have 2âÂÂ2.5 millimeter hairs on their inner surface. It has 12âÂÂ14 rows of stamens that are 1 millimeter long. Its ovoid fruit are 6âÂÂ12 by 4âÂÂ6 centimeters and brown and smooth. Its seeds are 9âÂÂ20 by 6âÂÂ11 millimeters.
The pollen of M. undulata is shed as permanent tetrads.
It has been observed growing in swampy terrain and along rivers, in rain forests, at elevations of .