Eugenia myrcianthes (synonym Hexachlamys edulis) or ubajay is a species of plant in the family Myrtaceae found in Argentina, Bolivia, Brazil, Paraguay and Uruguay.

[1][2] Eugenia myrcianthe is a densely branched tree with dark and sealed bark, reaching 4 to 8 m in height.

They are simple, opposite, with the pubescent petiole, from ovate-oblong to lanceolate, acuminate, 3 to 6 cm long; Coriaceous, show pubescence when young and becoming glabrous with age.

Flowers are typical of myrtaceae; Appearing in the leaf axils, and are white, solitary with up to fifty stamens.

The fruit is edible, with the orange pulp, very juicy, slightly tart aftertaste when fully ripe.