Monodora undulata

It is a tree reaching 20 meters (66 ft) in height. Its mature leathery leaves are 10–40 by 8–13 centimeters and come to a point at their tips. The leaves are smooth on their upper and lower surfaces. Its petioles are 5–10 millimeters long. Its pendulous flowers are solitary. Each flower is on a pedicel 30–55 millimeters long. Its flowers have 3 oval-shaped sepals that are 7–11 by 5–10 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, 3–4.5 by 1.5–3.0 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 2–2.7 by 1.5–2 centimeter blade. The inner petals are smooth on their outer surface, and have 2–2.5 millimeter hairs on their inner surface. It has 12–14 rows of stamens that are 1 millimeter long. Its ovoid fruit are 6–12 by 4–6 centimeters and brown and smooth. Its seeds are 9–20 by 6–11 millimeters.^[4]

The pollen of M. undulata is shed as permanent tetrads.^[5]

It has been observed growing in swampy terrain and along rivers, in rain forests, at elevations of 0–700 meters (0–2,297 ft).^[6]