Pycnostachys Hook.

POWO follows these authorities in synonymising this name:

• Paton, A.J., Mwanyambo, M. Govaerts, R.H.A., Smitha, K., Suddee, S., Phillipson, P.B., Wilson, T.C., Forster, P.I. & Culham, A. (2019). Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): A tale of more than two genera. PhytoKeys 129: 1-158. [Cited as Coleus.]

This name was accepted following an alternative taxonomy by these authorities:

• Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Pycnostachys.]

Flora of West Tropical Africa

• E. A. Bruce in Kew Bull. 1939: 563.
• Perkins in Notizbl. Bot. Gart. Berl. 8: 63 (1921)
• —F.T.A. 5: 379

Flora Zambesiaca

• Bruce in Bull. Misc. Inform., Kew 1939: 563–593 (1940).
• G. Bramley (2013). in J. R. Timberlake, E. S. Martins (eds). Flora Zambesiaca, Vol 8: part 8. Royal Botanic Gardens, Kew
• Hook., Exot. Fl. 3: t.202 (1826).
• Paton in Kubitzki, Fam. Gen. Vasc. Pl. 7: 267 (2004).
• Perkins in Notizbl. Bot. Gart. Berlin- Dahlem 8: 63–77 (1921).

Flora of Tropical East Africa

• Exot. Fl. 3: t. 202 (1826)
• Fam. Gen. Vasc. Pl. 7: 267 (2004)
• K.B. 1939: 563–593 (1940)

Lamiaceae Key Genus Fact Sheets

• Bruce, Kew Bull. Misc. Inf. 1939: 563-592 (1939), rev.
• Echinostachys E.Mey., Comm. Pl. Afr. Austr.: 243 (1838).
• Harley RM, Atkins S, Budantsev AL, Cantino PD, Conn BJ, Grayer R, Harley MM, de Kok RPJ, Krestovskaja T, Morales R, Paton AJ, Ryding O, and Upson T. 2004. Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Sp
• Pycnostachys Hook., Exot. Fl. 3: t. 202 (1826)