Taxonomic Remark and Typification of Helictotrichon sempervirens (Poaceae, Aveninae)

Abstract

Helictotrichon sempervirens (Poaceae), a common ornamental grass cultivated in rock gardens, described from southern France, is discussed and typified. The name is originally based on the basionym Avena sempervirens . The designation of a lectotype is based on an analysis of original material stored in the GRM herbarium, alongside the critical examination of diagnostic morphological characters, label data, protologue information, and Villars's botanical work. We also discuss the nomenclatural complexity associated with the names and distinctive morphological characters of H. sempervirens .