From, the invesigations on the changes in distribution of herbaceous and trees and their quantity, three vegatation zones were recognized, viz. Pieris japonica-Sasa nipponica-Asarum nipponicum Ass., Quercus serrata-Clethra barbinervis Ass. and Symplocos chinensis v. leucocarpa-Acer rufinerve-Para-benzoin trilobum Ass. Pieris japonica-Sasa-Asarum Ass. is caused by growing in groups of sixteenth types, viz. Clethra barbinervis-Sasa nipponica type, Clethra barbinervis-Pieris japonica type, Quercus serrata-Clethra barbinervis type, Quercus serrata-Parabenzoin trilobum type, Pieris japonica type, Pieris japonica-Sasa nipponica type, Pieris japonica-Ilex pedunculosa type, Pourthiaea villosa v. laevis-Pieris japonica type, Sasa nipponica type, Sasa-wither type, Pourthiaea villosa v. laevis-Quercus serrata-Sasa nipponica type, Ilex pedunculosa-Ilex crennata type, Quercus serrata-Sasa nipponica type, Miscanthus sinensis type, Sasa nipponica-Miscanthus sinensis type and Carex siderosticta type
