Lukhoba & A.J.Paton No year - Lukhoba C, Paton A (2000) Two New Species of Plectranthus L'Hér. (Labiatae) from East Africa. Kew Bulletin 55(4): 957-964. doi: 10.2307/4113642.
There is no corrections for Plectranthus agnewii yet.