Nomenclatural notes on the Polycarpon tetraphyllum aggregate (Caryophyllaceae)

Nomenclatural notes on the aggregate Polycarpon tetraphyllum (Caryophyllaceae) are discussed. The names Hagaea alsinifolia, H. polycarpoides, Poycarpon colomense, P. diphyllum, and P. floribundum are typified, respectively, on an iconography by Boccone (lectotype), and specimens preserved in PAL (neotype), JE (lectotype), MA (Herbarium Cavanilles, lectotype), and COI (Herbarium Willkomm, lectotype). For the nomenclatural purposes, the names P. bivonae (nom. nov. pro P. polycarpoides), P. herniarioides (holotype in K), P. peploides (nom. superfl.etnom. illeg. according to the Arts. 52.1 and 52.2 of the ICN), P. polycarpoides subsp. catalaunicum (holotype in BC), and P. rotundifolium (holotype in LY-Herbarium Rouy) are also discussed. P. floribundum is a heterotipic synonym of P. tetraphyllum s.s. A new synonym (P. tetraphyllum=P. rotundifolium) and three new combinations (P. tetraphyllum subsp. colomense, P. tetraphyllum subsp. herniarioides and P. tetraphyllum subsp. catalunicum) are proposed according to the current concept in Polycarpon.