Psidium sartorianum is a species of wild guava in the family Myrtaceae, native to Mexico and parts of Central America. Often called guayabillo, it is typically a shrub or small tree found in dry forests, thorn scrub, and open woodlands, where it is well adapted to seasonal drought and poor soils. Its fruits are smaller and less fleshy than cultivated guava (Psidium guajava), usually yellow to greenish when ripe, with a sweet but often more astringent or resinous flavour. These fruits are eaten by wildlife and sometimes by people locally, either fresh or processed.