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. 2019 Aug 23:129:1-158.
doi: 10.3897/phytokeys.129.34988. eCollection 2019.

Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): a tale of more than two genera

Alan J Paton  1 , Montfort Mwanyambo  2 , Rafaël H A Govaerts  1 , Kokkaraniyil Smitha  3 , Somran Suddee  4 , Peter B Phillipson  5 , Trevor C Wilson  6 , Paul I Forster  7 , Alastair Culham  8
Affiliations

Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): a tale of more than two genera

Alan J Paton et al. PhytoKeys. .

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.

Keywords: Anisochilus; Equilabium; Plectranthinae; Pycnostachys; Solenostemon; Ocimeae; generic delimitation; nomenclature.

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Figures

Figure 1.
Figure 1.
A Display of cultivated Coleus scutellarioides (L.) Benth. in the Real Jardin Botánico, Madrid. B Close up of the cultivar ‘Campfire’, winner of the Royal Horticultural Society’s peoples choice award at Wisley 2017 (Photo: A.Paton).
Figure 2.
Figure 2.
Summarised phylogeny of the Plectranthinae showing relationships of recognised genera following Paton et al. (2018): the numbers in triangles represent species numbers though the numbers of species in the two subclades of Coleus cannot be estimated (see discussion); dates of branching are given in black.
Figure 3.
Figure 3.
Calyx and corolla morphology. Calyces in Coleus with pedicel attached excentrically above midline of calyx: 1C. betonicifolius2C. platyphyllus showing the rounded lateral calyx lobe in some species of the formally recognized Solenostemon. Calyx in Equilabium with pedicel attached ± at centre of calyx base with the lateral lobe held midway between the anterior and posterior lobes: 3E. megafolium4E. masukensis. Calyces in Plectranthus with pedicel attached ± at centre of calyx base with the lateral lobe closer to the anterior than the posterior lobes: 5P. alboviolaceus. Corolla shape in Coleus showing unequal anterior and posterior corolla lips: 6C. schizophyllus7C. hockii. Corolla shape of Equilabium showing equal anterior and posterior corolla lips: 8P. parvus10P. laxiflorus. Corolla shape of Plectranthus showing equal anterior and posterior corolla lips and gibbous-based corolla: 9P. strangulatus;. Drawn by Emmanuel Papadopoulos. Reproduced from Flora of Tropical East Africa (Paton et al. 2009).
Figure 4.
Figure 4.
Species of Coleus 1. AColeus anamudianus (Photo: K. Smitha) BC. amboinicus (Photo: Neil Crouch) CC. barbatus (Photo: Neil Crouch) DC. bracteatus (Photo: Witawat Keiwbang) EC. harmandii (Photo: Thamarat Phutthai).
Figure 5.
Figure 5.
Species of Coleus 2. AColeus maculosus subsp. lanatus (Photo: Vincent Droissart) BC. mirabilis (Photo: David Goyder) CC. porphyranthus (Photo: Neil Crouch) DC. orthodontus (Photo: Bart Wursten) EC. tenuicaulis (Photo: Ernst van Jaarsveld) FC. strobilifer (Photo: Naiyana Tetsana).
Figure 6.
Figure 6.
Species of Equilabium 1. AEquilabium dolomiticum (Photo: Neil Crouch) BE. dissectum var. dissectum (Photo: Montfort Mwanyambo) CE. gracilum (Photo: Bart Wursten) DE. laxiflorum (Photo: Bart Wursten).
Figure 7.
Figure 7.
Species of Equilabium 2. AEquilabium laxiflorum (Photo: Bart Wursten) BE. petiolare (Photo: Neil Crouch) CE. subincisum (Photo: K. Smitha) DE. stenophyllum (Photo: Bart Wursten).
Figure 8.
Figure 8.
Species of Plectranthus 1. APlectranthus ambiguus (Photo: Neil Crouch) BP. brevicaulis (Photo: Jean Bosser) CP. brevimentus (Photo: Neil Crouch) DP. ciliatus (Photo: Neil Crouch) EP. fruticosus (Photo: Neil Crouch) FP. ecklonii (Photo: Neil Crouch).
Figure 9.
Figure 9.
Species of Plectranthus 2. APlectranthus papilionaceus (Photo: Patrick Ranirison) BP. purpuratus subsp. montanus (Photo: Neil Crouch) CP. saccatus var. longitubus (Photo RBG Kew) DP. vestitus (Photo: Patrice Antilahimena).
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References

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