A taxonomic revision of Schoenus compar - Schoenus pictus and allies (Cyperaceae, tribe Schoeneae) with three new species described from South Africa

Abstract

A taxonomic revision of the Schoenus compar - Schoenus pictus and allies group is presented, following a recent taxonomic realignment that transferred 24 southern African species into Schoenus from Tetraria and Epischoenus. In light of recent field collections and a thorough review of herbarium specimens, we revise the delimitations and distributions of three species (Schoenus compar, Schoenus arenicolus and Schoenus pictus) and raise Schoenus pseudoloreus to species level from its previous status as a variety of Tetraria sylvatica. In addition, we describe three new species (Schoenus aureus, Schoenus megacarpus and Schoenus filiculmis) predominantly occurring in the Cape Floristic Region of South Africa. Species in this group have either dilated primary inflorescence bracts or membraneous marginal extensions on the bracts that either partially or entirely cover spikes. Moreover, the sheaths and ligules are most often open and membranaceous. We present an identification key for these seven species and update their nomenclature, as well as provide detailed descriptions and distribution maps.