蝦夷方言藻汐草

The historical Japanese describes a plant with a globular underground part. Hirayama reproduces イツラプ without a comparative identification. Iturap remains a tentative reading of the kana; itrap is a comparison if ツ represents a final consonant. Neither plant identity nor word formation is established. Ota’s newly proposed iturap means grammatical complement and is irrelevant to this botanical sense.