Palaihnihan is a language family consisting of two languages:

• Atsugewi
• Achumawi

The Palaihnihan family is often connected with the hypothetical Hokan stock.

Bibliography

• Bright, William. (1965). [Review of A history of Palaihnihan phonology by D. L. Olmstead]. Language, 41 (1), 175-178.
• Good, Jeff; McFarland, Teresa; & Paster, Mary. (2003). Reconstructing Achumawi and Atsugewi: Proto-Palaihnihan revisited. Atlanta, GA. (Paper presented at the annual meeting of the Society for the Study of the Indigenous Languages of the Americas, January 2–5).
• Mithun, Marianne. (1999). The languages of Native North America. Cambridge: Cambridge University Press. ISBN 0-521-23228-7 (hbk); ISBN 0-521-29875-X.
• Olmstead, David L. (1954). Achumawi-Atsugewi non-reciprocal intelligibility. International Journal of American Linguistics, 20, 181-184.
• Olmstead, David L. (1956). Palaihnihan and Shasta I: Labial stops. Language, 32 (1), 73-77.
• Olmstead, David L. (1957). Palaihnihan and Shasta II: Apical stops. Language, 33 (2), 136-138.
• Olmstead, David L. (1959). Palaihnihan and Shasta III: Dorsal stops. Language, 35 (4), 637-644.
• Olmstead, David L. (1964). A history of Palaihnihan phonology. University of California publications in linguistics (Vol. 35). Berkeley: University of California Press.