biostudies-literatureUnknown206Trujillo WWe describe four new species of <i>Piper</i> from the Amazonian slopes of the northern Andes. <i>Piperhoyoscardozii</i> is distinguished from similar climbing species, <i>P.dryadum</i> and <i>P.flagellicuspe</i>, by its longer peduncles. The Amazonian species <i>Piperindiwasii</i> is distinguished from <i>P.scutilimbum</i> from Panama and northern Colombia by the narrowly spatulate leaf base extension. <i>Pipernokaidoyitau</i> is characterised by the presence of larger leaves and longer spikes than similar species, <i>P.anonifolium</i> and <i>P.hostmannianum</i>. Finally, <i>P.velae</i> is characterised by cordulate leaf bases in all nodes, petioles 0.8-1.5 cm long and pubescent fruits, which easily distinguish it from the related species, <i>P.holdridgeanum</i>.PhytoKeys25-48https://www.ebi.ac.uk/biostudies/studies/S-EPMC9848990biostudies-literatureNew <i>Piper</i> species from the eastern slopes of the Andes in northern South America.PMC9848990Trujillo WJaramillo MATrujillo ETOrtiz-Morea FAToro DAfalseNew <i>Piper</i> species from the eastern slopes of the Andes in northern South America.We describe four new species of <i>Piper</i> from the Amazonian slopes of the northern Andes. <i>Piperhoyoscardozii</i> is distinguished from similar climbing species, <i>P.dryadum</i> and <i>P.flagellicuspe</i>, by its longer peduncles. The Amazonian species <i>Piperindiwasii</i> is distinguished from <i>P.scutilimbum</i> from Panama and northern Colombia by the narrowly spatulate leaf base extension. <i>Pipernokaidoyitau</i> is characterised by the presence of larger leaves and longer spikes than similar species, <i>P.anonifolium</i> and <i>P.hostmannianum</i>. Finally, <i>P.velae</i> is characterised by cordulate leaf bases in all nodes, petioles 0.8-1.5 cm long and pubescent fruits, which easily distinguish it from the related species, <i>P.holdridgeanum</i>.2022-01-01T00:00:00Z20222026-04-08T12:26:27.655Z2025-04-25T17:10:17.562ZS-EPMC98489903676127310.3897/phytokeys.206.75971