It is a
heliophyte tree, large, over 27
m tall and up to 13
dm in trunk diameter, straight, cylindrical; sometimes hollow in the first few meters; cracked bark, longitudinal fissures; asymmetrical crown. Leaves compound, imparipinnate, 13-19-
folioles, 6-9
cm long, pinnately veined, yellowish scales on the underside; dark green on the adaxial side. Annual, synchronous flowering; tiny, yellowish flowers in terminal panicles; persistent
calyx with basal glands, 10-
stamens (monadelphous),
ovary sessile to briefly stipitate, punctate, glandular, 1-3 ovules, curved style. Indehiscent
fruit, samaroid, distal wing, 1-2 seeds, acicular spiny chamber; style persistent as a
lateral spine; it is three times the size of the chamber, covered with peltate scales. Anemophilous seed dispersal, up to 100 m away; a large quantity of the seed is not viable. == References ==