It has wide-spreading branches with dotted grey branchlets with reddish to white or yellowish "trichomes" or hairs.

The entire leaf is glabrous and is generally darker on the upper face and paler on the other side.

[3] The buds of Psidium oligospermum are pear-shaped or "pyriform" and connected to the base of the branchlet, extending about 1–1.5 mm (0.039–0.059 in) out.

[3] Flowers are white, occur on branches of recent growth, and are relatively small, being 1–1.5 cm (0.39–0.59 in) in diameter.

[3] The wood of the tree is used locally in the Galápagos Islands as fencing or a building material, but is not very hardy nor enduring.