The genus Jacquemontia Choisy comprises climbing, rarely erect herbs or subshrubs with stellate, rarely forked, glandular or simple trichomes, simple style with two terminal, ellipsoidal stigmas, and capsules opening through eight valves. This study aims to clarify the delimitation of a group of eight easily confused species of this genus, including Jacquemontia evolvuloides (Moric.) Meisn. and seven related species that form a group characterized by equal lanceolate, acuminate sepals and rotate-infundibuliform corolla. An identification key, relation of the synonyms, type material, selected examined material, comments regarding the taxonomy and distribution of the species are provided. Twelve new synonyms are proposed, and four lectotypes are designated.