Costaceae Nakai
Costus subg. Eucostus K.Schum. , nom. inval., scientific
Schumann, K. in Engler, H.G.A. (1904), Das Pflanzenreich 20: 379, 381 [primary reference]
  • Comment: nom. inval. under ICN Art. 26.2 (Shenzhen Code, 2018), as this was intended to be the type variety but the varietal name does not repeat the specific epithet.
Council of Heads of Australasian Herbaria (29 September 2022), Australian Plant Census: - [taxonomic synonym]
taxonomic synonym of: Costus L. legitimate