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1. The plant commuity for the habitat of Pteridodhyllum racemosum SIEB. et Zucc. (Papaveraceae) in the northern mountainside of Mt. ONTAKE and it adjacent plant communities were investigated. 2. The plant community whom the plant Pteridophyllum racemosum SIEB. et Zucc. belonged to was Pteridophyllum racemosum Association (n.). It was defined that the adjacent plant community were Abies veitchii-Sasa borealis f. amabilis Association (n.) and Abies veitchii-Vaccinium yatabei Association (n.) and the plant communities were named. 3. The data for investigation about plant communities of the every mountainu\u27s subalpine in NIPPON was examined. The formation of the each community was considered, and then the following system was suggested. Picea jezoensis var. hondoensis order (n.) A. Picea jezoensis var. hondoensis-Tsuga diversifolia alliance (n.) Aa. Tsuga diversifolia suballiance (n.) Ab. typical suballiance B, Abies veitchii alliance (n.) C. Abies veitchii-Abies mariesii alliance (n.) D. Abies mariesii alliance (n.