Nomenclatural changes and typifications of Arctotis species (Asteraceae, Arctotideae) from the Western Cape and Eastern Cape provinces of South Africa

Robert J Mckenzie

doi:10.3372/wi.48.48103

Abstract

In preparation for the treatment of Arctotis L. (Asteraceae) in the e-Flora of South Africa project, the correct names, typifications and synonymies are clarified for 24 Arctotis species and two varieties indigenous to the Western Cape and Eastern Cape provinces of South Africa. Lectotypes are designated for 36 names and neotypes for two names. The names A. glabrata Jacq., A. paniculata Jacq. and A. spinulosa Jacq. are resurrected for poorly known, apparently geographically restricted species. Arctotis roodae Hutch. is the correct name at specific rank for the taxon previously known as A. campanulata var. puberula DC. Arctotis laciniata Lam. is the earliest legitimate name for an element of the A. aspera species complex, to which the name A. revoluta Jacq. has often been applied. The name A. revoluta Jacq. correctly applies to a distinct, unrelated species, for which a revised synonymy is presented. A lectotype is designated for the illegitimate name A. undulata Jacq., the earliest legitimate name for which is A. acaulis var. undulata Less.

Highlights

Arctotis L. is the largest genus in the Asteraceae subtribe Arctotidinae, comprising an estimated 70 species, and is widely distributed in southern Africa (Karis & al. 2009)
The genus was described by Linnaeus (1753), but the taxonomy has long been in a chaotic state and is the focus of an ongoing revision
Previous publications have resolved some of the taxonomic and nomenclatural problems in the genus (e.g. McKenzie & al. 2006; McKenzie & Barker 2007; McKenzie & al. 2008a, 2008b, 2010; McKenzie & Barker 2010, 2013), but more than 70 validly published names require typification, predominantly those relating to species indigenous to the Western Cape and Eastern Cape provinces of South Africa

Summary

Introduction

Arctotis L. is the largest genus in the Asteraceae subtribe Arctotidinae, comprising an estimated 70 species, and is widely distributed in southern Africa (Karis & al. 2009). The specimens are consistent with the illustration and description provided by Jacquin (1797), and the sheet is designated here as the lectotype of A. undulata Jacq. The sheet in P-LA annotated “Arctotis laciniata β Enc.” is designated here as the lectotype of A. leucantha and the name is here placed in the synonymy of A. aspera.

Results

Conclusion