Solanum stellaticalycinum, a new simple-leaved species of the Pteroidea clade from Peru (Potato Clade, Solanum, Solanaceae)

A new species from the montane forests in central Peru belonging to the Pteroidea clade of <i>Solanum</i> is described and illustrated. <i>Solanum stellaticalycinum</i> M.A.Cueva, Treviño & D.Sotomayor, <b>sp. nov.</b> is known only from the Yanachaga-Chemillén National Park and adjacent areas (Prov. Oxapampa, Dept. Pasco, Peru). With simple leaves, it is morphologically similar to <i>S. anceps</i> Ruiz & Pav., a widespread species in South America, and to <i>S. angustialatum</i> Bitter and <i>S. incurvum</i> Ruiz & Pav., both known from the montane forests of northern and central Peru. <i>Solanum stellaticalycinum</i> is distinguished from all these by its purple pedicels and flowers with linear to narrowly triangular calyx lobes, a membranous corolla with lanceolate lobes and ovoid-conical, smooth or slightly rugose fruits. Here we discuss the taxonomic affinities, distribution and conservation status of this new species. We also include a key to all species of Pteroidea with complete distributions at the country level and department level distributions within Peru.