Lopezia is a genus of plants of the family Onagraceae, largely restricted to Mexico and Central America.
Herbs or shrubs, mostly freely branched. Leaves petioled, alternate, or the lower opposite, simple. Flowers -solitary, small, pedicelled, in upper axils of sometimes much reduced leaves. Floral tube inconspicuous. Sepals 4, mostly red, narrow. Petals 4, dissimilar, white to rose, the 2 upper unguiculate, with none, one, or two glands at apex of claw; the 2 lower clawed and curved upward, glandless. Stamens 2, adnate to the style and connate with each other at the base, the posterior fertile, the anterior sterile, petaloid. Ovary 4-loculed; style short, filiform, with slightly enlarged and barely lobed stigma; ovules multiseriate, many. Capsule globose to clavate, coriaceous, 4-loculed and -valved. Seeds many, obovoid, granulate.
The genus name of Lopezia is in honour of Manuel López-Figueiras (1915-2012), who was a (Spanish-) Venezuelan botanist (Mycology and Lichenology), from the University of Havana (in Cuba).
It is found in Costa Rica, El Salvador, Guatemala, Honduras, Mexico and Panamá.
According to Kew, there are 28 species are recognized in the genus Lopezia in 2022: