A new species of Psidium from western Ecuador

Psidium guayaquilense from western Ecuador is described and illustrated. It is most similar to P. acidum, having in common with it non-angular, rounded seeds, anthers with a few subequal glands and peduncles with wings. Psidium guayaquilense differs from P. acidum in various ways, most notably in the principal marginal veins mainly 1-3 mm from margin (versus 3-10 mm or more from margin in P. acidum); closed calyx with a prominent apiculum (versus without an apiculum or with only a weak apiculum); ovules per locule 12-40 (versus 50-70); style 8-10 mm long (versus 12-16 mm); fruit 1.5-3 cm in diameter (versus 2-5 cm); fruit wall 0.5-2.5 mm thick (versus 4-13 mm); seeds usually 4-6 (versus 20-60 or more).