Forster, P.I. (1 September 1994), Ten new species of Plectranthus L'Her. (Lamiaceae) from Queensland. Austrobaileya 4(2): 181-182, Fig. 9 [tax. nov.]

• Type: "Queensland: Cook District: Rocky River Scrub, eastern fall of McIlwraith Range, 16 June 1992, P.I.Forster 10637A, M.C.Tucker & G. Kenning (holo: BRI [2 sheets + spirit]); iso: K, L, MEL, QRS)."

• Etymology: "The specific epithet is derived from the Greek mega (large) and dontus (teeth) and refers to the large marginal teeth of the leaves in this species in comparison with those on most other Australian species."

Forster, P.I. in Henderson, R.J.F. (ed.) (2002), Lamiaceae. Names and Distribution of Queensland Plants, Algae and Lichens: 96 [secondary reference]

Queensland Herbarium (2003), New plant names and taxa Queensland July 1994-July 2003: 18 APC [secondary reference]

taxonomic synonym: Plectranthus sp. Rocky River (P.I.Forster+ PIF10637A) Qld Herbarium [n/a]

• APC Dist.: Qld

Paton, A.J., Mwanyambo, M., Govaerts, R.H.A., Smitha, K., Suddee, S., Phillipson, P.B., Wilson, T.C., Forster, P.I. & Culham, A. (23 August 2019), Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): a tale of more than two genera. Phytokeys 129: 72 [basionym]

basionym of: Coleus megadontus (P.I.Forst.) P.I.Forst. legitimate

Brown, G.K. & Bostock, P.D. (December 2019), Appendix A: New names and name and status changes 2018 to 2019. Introduction to the Census of the Queensland Flora 2019: 9 [nomenclatural synonym]

nomenclatural synonym of: Coleus megadontus (P.I.Forst.) P.I.Forst. legitimate

Forster, P.I. (7 December 2022), Austrobaileya publication dates 1977–2022. Austrobaileya 12: 118 [secondary reference]

• Comment: Publication date corrected to 1 September 1994

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