Abstract
A synopsis of the genera Coleus Lour, Equilabium A.J.Paton, Mwany. & Culham and Plectranthus L’Hér. (Lamiaceae, Tribe Ocimeae, Subtribe Plecranthinae) is presented. Generic delimitation follows a recently published molecular phylogeny which identified Coleus as the sister of the remaining genera of Subtribe Plectranthinae; Plectranthus as sister to Tetradenia Benth. and Thorncroftia N.E.Br., and a separate phylogenetically distinct genus Equilabium comprising species previously placed in Plectranthus. In this treatment, 294 species of Coleus, 42 of Equilabium, and 72 of Plectranthus are recognized. All but one of the combinations in Equilabium are new as only the genus and type species have been previously published. Two-hundred and twelve names are changed to combinations in Coleus from Plectranthus, Pycnostachys Hook. and Anisochilus Benth.
Highlights
Plectranthus was described by L’Héritier in 1788 (L’Héritier 1788) and Coleus by Loureiro in 1790 (de Loureiro 1790)
Morton placed weight on calyx characteristics leading him to recognize several genera based on calyx morphology including Solenostemon, Isodictyophorus A.Chev, Leocus A.Chev., Englerastrum Briq. and Neohyptis J.K.Morton
Cramer suggested Plectranthus could have a 3-lobed upper calyx lip, but that is misleading since he was considering species of Isodon (Schrad. ex Benth.) Spach as part of Plectranthus: Isodon is recognized in a separate subtribe and is very distinct from the Plectranthinae (Ryding 1993, Harley et al 2004, Zhong et al 2010)
Summary
Plectranthus was described by L’Héritier in 1788 (L’Héritier 1788) and Coleus by Loureiro in 1790 (de Loureiro 1790). 294 species of Coleus, 42 of Equilabium, and 72 Plectranthus are recognized. Robyns et Lebrun (here recognized under Coleus engleri (Briq.) A.J.Paton, non C. africanum Benth.). Type: Neohyptis paniculata (Baker) J.K.Morton (here recognized under Coleus guerkei (Briq.) A.J.Paton, non Coleus paniculatus Benth.). Type: R. calycina (Bentham) Codd (here recognized as Coleus calycinus (Benth.) A.J.Paton).
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