Plectranthus alpinus

References

1. [1]Plants of the World online — http://powo.science.kew.org/ ↩︎An on-line database giving detailed descriptions of almost 40,000 species of plants (as of 2018), almost 25,000 images and a list of almost 850,000 plant names. A truly excellent resource and still growing.
2. [2]Flora of Tropical Africa Vol 1 - 8 — Var · L.Reeve & Co.; Ashford, Kent. · 1868 - 1917 · http://www.biodiversitylibrary.org ↩︎Very little information on habitat, range and uses, but gives good descriptions of the plants. It can be downloaded from the internet.
3. [3]Plectranthus: A review of ethnobotanical uses — Lukhoba C.W.; Simmonds M.S.J.; Paton A.J. · 2006 ↩︎An excellent guide to the uses of Plectranthus species, giving the basic uses and the literature supporting this.