Guavas are plants in the myrtle family -LRB- Myrtaceae -RRB- genus Psidium , which contains about NUMBER@1 species of tropical shrubs and small trees .

Guavas are plants in the genus Psidium of the myrtle family -LRB- Myrtaceae -RRB- . There are about NUMBER@1 species of tropical shrubs and small trees in the genus .
