Psidium myrtoides, commonly known as purple forest guava or araçá-una, is a species of plant in the family Myrtaceae.

It is found in Atlantic Forest in São Paulo and northern Paraná, Brazil.

It blooms from October to December with solitary white flowers.

Fruits are round and 2.5–4.2 cm wide with a reddish pulp that is somewhat bitter and around ten white seeds.

[2] The plant is tolerant of different types of soil with pH ranging from 5.5 to 6.2.