Plectranthus guerkei Briq.

This name was accepted following an alternative taxonomy by these authorities:

• Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers. [Cited as Plectranthus guerkei.]
• Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew. [Cited as Plectranthus guerkei.]
• Figueiredo, E. & Smith, G.F. (2008). Plants of Angola. Strelitzia 22: 1-279. National Botanical Institute, Pretoria. [Cited as Plectranthus guerkei.]
• Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Plectranthus guerkei.]
• Paton, A.J., Bramley, G., Ryding, O., Polhill, R., Harvey, Y., Iwarsson, M., Willis, F., Phillipson, P., Balkwill, K., Lukhoba, C., Otiend, D & Harley (2009). Lamiaceae (Labiatae). Flora of Tropical East Africa: 1-430. [Cited as Plectranthus guerkei.]
• Paton, A.J., Bramley, G., Ryding, O., Polhill, R.M., Harvey, Y.B., Iwarsson, M., Otieno, D., Balkwill, K., Phillipson, P.B., Harley, R.M. & Willis, F. (2013). Flora Zambesiaca 8(8): 1-346. Royal Botanic Gardens, Kew. [Cited as Plectranthus guerkei.]

Flora Zambesiaca

• Briq. in Ann. Conserv. Jard. Bot. Genève 7/8: 323 (1904).
• Figueiredo & Smith, Pl. Angola: 108 (2008).
• Paton in F.T.E.A., Lamiaceae: 317 (2009).

Flora of Tropical East Africa

• Ann. Conserv. Jard. Bot. Genève 7–8: 323 (1904).