Uvariastrum hexaloboides is a species of plant in the Annonaceae family. It is native to Tanzania, Zambia and Zaire. Robert Elias Fries, the botanist who first formally described the species using the basionym Uvaria hexaloboides, named it after a different species Hexalobus monopetalus which he thought its flowers and vegetative parts resembled.
It is a tree reaching 15 meters in height. The young, brown branches are densely hairy, but become hairless and dark brown with maturity. Its narrowly elliptical to egg-shaped, leathery leaves are 6âÂÂ13 by 2.4âÂÂ5 centimeters. The leaves have wedge-shaped to rounded bases and tapering tips, with the tapering portion 1âÂÂ2 centimeters long. The tips of the leaves have a shallow notch. The leaves are hairless on their dark green upper surface and sparsely hairy on their lighter green lower surfaces. The leaves have 9âÂÂ14 pairs of secondary veins emanating from their midribs. Its petioles are 0.1âÂÂ0.3 millimeters long, and covered in dense red-brown hairs, with a broad groove on their upper side. Its solitary or paired Inflorescences occur on branches and sometimes the trunk. Each inflorescence has 1 flower. Each flower is on a densely hairy pedicel that is 0.5âÂÂ6 by 1âÂÂ2 millimeters. The pedicels have 1âÂÂ2 oval, basal bracts that are 2âÂÂ7 by 3âÂÂ6 millimeters and densely hairy. Its flowers have 3 oval sepals that are 0.9âÂÂ1.5 by 0.7 by 1.8 centimeters. The sepals are densely hairy on both surfaces, and hairier at their margins which are slightly folded. Its 6 petals are arranged in two rows of 3. The yellow to green-yellow, elliptical, outer petals are 2âÂÂ3.5 by 1-1.4 centimeters with densely hairy upper and lower surfaces. The yellow to green-yellow, oval inner petals are 1âÂÂ2.5 by 0.8âÂÂ1.5 centimeters with densely hairy upper and lower surfaces. The flowers have numerous stamens that are 3 by 0.5 millimeters. The flowers have up to 10âÂÂ14 carpels that are 3 millimeters long, and densely hairy. The carpels have bilobed stigma. The fruit occur in clusters of 1âÂÂ5 on sparsely hairy pedicles that are 0.5âÂÂ2 by 2âÂÂ5 centimeters. The red, hairless, oblong fruit are 2.5âÂÂ6 by 2-2.5 centimeters. Each fruit has up to 6âÂÂ10 dark brown, elliptical seeds that are 15âÂÂ20 by 8âÂÂ12 by 6âÂÂ8 millimeters.
The pollen of Uvariastrum hexaloboides is shed as permanent tetrads.
It has been observed growing rocky or red sandy loam soil in woodlands at altitudes between 1000 and 1600 meters.
It has been described as being used as a source of edible fruit in Zambia.