Abstract
A new species of Passiflora is described from reforested post bauxite-mined area in the National Forest of Saracá- Taquera in the Brazilian state of Pará. The species is illustrated and its affinities with related species are discussed, and a key to the species of supersection Laurifoliae, series Quadrangulares is presented. The series Quadrangulares is composed of four species that constitute a small complex of large-flowered and large-fruited passionflowers with 3–4- angulate-winged stems that occurs naturally in the moist lowlands from Nicaragua to Brazil and French Guiana. However, among the four species of the series, Passiflora trialata is closely related to the new species by the 3-angular stems, the color and shape of sepals and petals, the 3-angular petioles and peduncles, and the single operculum.