<strong>Typification and nomenclatural clarifications of <em>Mesembryanthemum purpurocroceum</em> and <em>M. insititium</em> (Ruschioideae, Aizoaceae)</strong>

Abstract

The typification of the names Mesembryanthemum purpurocroceum and M. insititium are discussed. A neotype (illustration by Duncanson) and a lectotype (a specimen at B in Willdenow’s Herbarium) are designated. Epitypes (deposited at BOL) are also selected for both names. Nomenclatural issues about the specific epithet “purpurocroceum” are discussed. The two names are accepted here in Malephora as heterotypic synonyms, with M. purpurocroceum having nomenclatural priority.

The genus Sesuvium (Aizoaceae, Sesuvioideae) in the Southern Cone

“…We have found two sheets corresponding to original materials of S. revolutifolium at Willdenow's herbarium (B-W). The B-W specimens are considered as part of the original material of S. revoluti folium, published by Willdenow in his Enumeratio plan tarum, partly on the basis of the statements of the "Praefatio" (Willdenow 1809: V) (see e.g., Jocou et al 2020a). However, this is only a guide, indicating that Willdenow saw at least one specimen from his herbarium, but not necessarily any particular specimen extant in B-W.…”

“…However, this is only a guide, indicating that Willdenow saw at least one specimen from his herbarium, but not necessarily any particular specimen extant in B-W. Since the sheets of the specimens shows handwriting by Willdenow, there is no reason to doubt that these specimens are original material for the name as reported by various authors (e.g., Iamonico 2020, Jocou et al 2020a). Since Willdenow (1809) did not indicate the holotype and the existence of two sheets, theses specimens are syntypes and a lectotypification is necessary (Arts.…”

“…As part of the ongoing floristic and taxonomic studies of Aizoaceae (see e.g., Jocou et al 2019a, Jocou & Minué 2020, Jocou et al 2020a) and floristic and ecological studies in Argentina (see e.g., , Minué & Gandullo 2019, Jocou et al 2019b, 2020b, Jocou & Brignone 2020, Minué et al 2021, we revised the genus Sesuvium for the Southern Cone.…”