Abstract
The Passiflora subgenus Astrophea has its greatest diversity in the Amazon Rainforest, which is the largest biodiversity reserve in the world. During a taxonomic revision of Brazilian Astrophea species, a new species was discovered from the municipality of São Gabriel da Cachoeira in the state of Amazonas. Morphological and palynological analysis, as well as comparisons with related species, confirmed that the specimen represents a new species to science belonging to the Passiflora subgenus Astrophea, section Pseudoastrophea. Passiflora lorenziana is the name given to the new Amazonian species, which is herein described, illustrated and compared to related species.