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55. Plectranthus L'Herit., Stirp. Nov. 84 verso. 1788. - nom. conserv.; Codd, Plectranthus and allied genera in southern Africa, in Bothalia 11: 371- 374. 1975; Keng in van Steenis, Fl. Males. 8, 3: 382. 1978.
I.C. Hedge
Coleus Lour.
Perennial herbs or subshrubs, often aromatic, with an indumentum of simple hairs. Leaves undivided, often fleshy, crenate to serrate, petiolate. Flowers in cymes, paniculate or On ours) spike-like, violet or bluish. Calyx bilabiate, campanulate, teeth markedly unequal; upper lip of 1 broadly ovate lobe; lower lip of 4 acuminate teeth; tube annulate within; calyx enlarging and often deflexed in fruit. Corolla bilabiate; upper lip short 4-lobed; lower lip entire, cucullate longer than upper; tube exserted from calyx usually curved and swollen above. Stamens 4, declinate, didynamous; filaments On ours) united into a basal sheath, glabrous or not; thecae unilocular by fusion. Style subequally bifid at apex. Nutlets ovoid to oblong, mucilaginous on wetting or not.
A large genus with close affinities to Isodon, q.v. The problems of generic delimitations around Plectranthus in the very wide sense can only be resolved by a global review which includes the very numerous Asian and Afri-can species.
Some species are cultivated as ornamentals; others for their tuberous roots.
Lower Taxon
Related Synonym(s):
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