蝦夷方言藻汐草

Ukuran is retained as the established lexical interpretation: Tamura and Nakagawa document last night or evening. Kirikae records okuran with Kushiro speaker examples, which remain relevant dialect evidence. The written ヲ alone does not establish that this occurrence should replace ukuran with that dialect form. Japanese 夜来 leaves the exact time span qualified. The lone okuran corpus record is uncertain; it is not the basis for selecting a reading.