Typifications in the genus Arundo L. (Poaceae, Arundinoideae)

The typification of the names A. micrantha, A. donaciformis, A. formosana, A. formosana var. gracilis (currently A. formosana subsp. gracilis), A. parviflora (a heterotypic synonym of A. formosana), A. bifaria, and A. donax var. coleotricha (these two as heterotypic synonyms of A. donax) is discussed. The “types” of these names were previously indicated as “holotypes” in 2012 and 2017. However, the type indication was ineffective in all cases according to the International Code of Nomenclature for algae, fungi, and plants (ICN, Shenzhen Code of 2018). We proposes here the effective lectotypification of these five names, along with data on the gatherings and syntypes used to describe these taxa. The name A. micrantha is lectotypified using a specimen collected by Desfontaines and preserved at P. The lectotype of A. donaciformis is selected from a specimen collected by Jean Honoré Perreymond in southern France and kept at AV (Muséum Requien). Arundo formosana and A. formosana var. gracilis are typified from original specimens preserved in the Hackel Herbarium at W. The lectotype of the name A. parviflora is designated from a specimen preserved at US. Finally, a second-step lectotypification is made for the name A. bifaria with the lectotype preserved at LD, and the lectotype of A. donax var. coleotricha is selected from a specimen preserved at W