Prunus costata is a species of flowering plant in the family Rosaceae.

It is a tree reaching 25 m, and is morphologically very similar to Prunus grisea var grisea, aside from their seeds.

[6] It flowers are borne on a raceme and have white petals only 1-3 mm long, with 20 to 35 stamens each.

The numerous stamens are typically 5.5 mm long, giving the flowers a bristly appearance.

[7] The type specimen was collected on Mt.