Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Lamiaceae
Subfamily: Nepetoideae
Tribe: Ocimeae
Genus: Plectranthus
Species: P. mahonii
Binomial name: Plectranthus mahonii
Synonym: Coleus mahonii
Common name: Shrubby plectranthus

Plectranthus mahonii is a semi-scrambling, unpleasantly scented, shrub from tropical Africa, Malawi. Tanzania and Mozambique. It is a shrub with slender branchlets and can grow up to 3 m tall. The green ovate leaves are up to 8cm long and the margins are serrated. The veins are raised on the paler underside.
Flowers are a bright purple and are on racemose inflorescences. Flowers summer to late April.

Plectranthus mahonii photographed at Tupare Gardens, New Plymouth, New Zealand.
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The paler underside of a leaf with raised veins.
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Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/