Note: A nomen novum for Perrierastrum oreophilum which is based on 4 syntypes and is lectotypified by Perrier de la Bâthie 13729 ( Hedge et al., 1998 designated this specimen 'Holotype' but this was in fact an act of lectotypification: see ICBN Art. 9.8; 9.21). The name Plectranthus oreophilus Diels (= Skapanthus oreophilus (Diels) C. Y. Wu & H. W. Li) refers to a Chinese species.