Howard Berman provides rather convincing evidence to include Molala within Plateau Penutian. Yakama is a northwestern dialect of Sahaptin, a Sahaptian language of the Plateau Penutian family. The Molala language was a member of the Plateau Penutian family. Yokutsan is a key member in the proposed Penutian language stock. The Wintu language is part of the Penutian language family. It was one of the original members of California Penutian (the Penutian "core"). Some linguists classify Tsimshian languages as a member of the theoretical Penutian language group. The Maidu spoke a language that some linguists believe was related to the Penutian family. Some of the more recently proposed subgroupings of Penutian have been convincingly demonstrated. Mayan has also been included in various Hokan and Penutian hypotheses. The Multnomah speak a dialect of the Upper Chinookan language in the Oregon Penutian family. Maiduan is often considered in various Penutian phylum proposals. The Patwin language is a Penutian language. While Greenberg groups Tzeltal with the proposed Penutian superfamily, this hypothesis is not well attested.