|East Sepik Province, Papua New Guinea|
|Linguistic classification||Ramu–Lower Sepik|
The Grass languages are a group of languages in the Ramu language family. It is accepted by Foley (2018), but not by Glottolog. They are spoken in East Sepik Province, Papua New Guinea, with a small number of speakers also located just across the provincial border in Madang Province.
Foley (2018) notes that Grass languages share very few lexical items with the other Ramu languages, with virtually no lexical cognates Banaro and Ap Ma. However, the Grass languages are still classified as Ramu due to widely shared morphosyntax and typology. Foley (2018: 205) leaves open the possibility of Grass being a third branch of the Lower Sepik-Ramu family, with Lower Sepik and Ramu being sister branches.
Like the neighboring Yuat languages, Grass languages distinguish between inclusive and exclusive first person pronouns, a feature not found in most other Papuan languages. This typological feature has diffused from Yuat into the Grass languages.
The original Grass language proposal, also known as Keram, included several languages, such as Banaro and Kambot (Ap Ma), that are no longer thought to be closely related to Adjora and Gorovu.
Timothy Usher (as reported in Glottolog) broke it up still further, with only Abu (Adora) and Gorovu kept together (in a "Porapora River" or "Agoan" branch), Aion (Ambakich) and Kambot (Ap Ma) grouped with the Mongol–Langam languages, and Banaro left as a primary branch of Ramu proper.
- Porapora languages: Aion (Ambakich), Gorovu, Adjora (Abu)
- Koam languages: Mongol, Langam, Yaul-Dimiri
- Ap Ma (Kambot / Botin)
- Foley, William A. (2018). "The Languages of the Sepik-Ramu Basin and Environs". In Palmer, Bill (ed.). The Languages and Linguistics of the New Guinea Area: A Comprehensive Guide. The World of Linguistics. 4. Berlin: De Gruyter Mouton. pp. 197–432. ISBN 978-3-11-028642-7.
- Donald C. Laycock, 1973. "Sepik languages: checklist and preliminary classification". Pacific linguistics, Series B, Issue 25. Australian National University, Department of Linguistics.
- Andrew Pawley, 2005, Papuan pasts
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Agoan". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- Foley, William A. (2005). "Linguistic prehistory in the Sepik-Ramu basin". In Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson (eds.). Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. pp. 109–144. ISBN 0858835622. OCLC 67292782.
- Ross, Malcolm (2005). "Pronouns as a preliminary diagnostic for grouping Papuan languages". In Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson (eds.). Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. pp. 15–66. ISBN 0858835622. OCLC 67292782.