Pseudoxandra polyphleba is a species of plant in the family Annonaceae. It is native to Bolivia, Brazil, Colombia, French Guiana, Guyana, and Peru. Ludwig Diels, the German botanist who first formally described the species using the basionym Unonopsis polyphleba, named it after the distinctive veins (Latinized form of Greek , ) in its leaves.
It is a tree reaching in height. Its dull papery leaves are 10âÂÂ19 by 3âÂÂ6 centimeters and come to a point at their tips. The leaves are hairless on their upper and lower surfaces, but can have small warty bumps. The leaves have 10âÂÂ15 distinct, straight secondary veins emanating from the primary vein. Its petioles are 2âÂÂ7 millimeters long. Its flowers are solitary or in pairs and axillary. Each flower is on a pedicel 2âÂÂ5 millimeters long. Its flowers have 3 oval-shaped sepals that are 1âÂÂ2 by 2âÂÂ3 millimeters. The outer surface of the sepals is hairless or slightly hairy. Its 6 petals are arranged in two rows of 3. The outer petals are white to yellow and 4âÂÂ10 by 3âÂÂ5 millimeters. The outer petals are hairless on their outer surface. The inner petals are similarly colored and 3âÂÂ8 by 3âÂÂ5 millimeters. The inner petals are smooth on their outer surface. It has numerous stamens that are 1.5âÂÂ1.7 millimeters long. Each flower has 2âÂÂ20 monocarps that are yellow, red, or near black at maturity and 10âÂÂ15 millimeters wide. Its brown seeds are 8âÂÂ13 by 7âÂÂ12 millimeters.
The pollen of P. polyphleba is shed as permanent tetrads.