Greeneochloa is a genus of grasses. It includes three species native to North America and Hawaii. These species were formerly placed in genus Calamagrostis.Peterson, P.M., Soreng, R.J., Romaschenko, K., Barberá, P., Quintanar, A., Aedo, C. and Saarela, J.M. (2022), Phylogeny and biogeography of Calamagrostis (Poaceae: Pooideae: Poeae: Agrostidinae), description of a new genus, Condilorachia (Calothecinae), and expansion of Greeneochloa and Pentapogon (Echinopogoninae). J. Syst. Evol., 60: 570–590. https://doi.org/10.1111/jse.12819
Three species are accepted. Greeneochloa coarctata – eastern United States Greeneochloa expansa – Hawaiian Islands Greeneochloa tweedyi – northwestern United States
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