Flower bud formation and development of 'Kawazu-zakura' cherry tree

The flower bud formation and development of ‘Kawazu-zakura’ cherry (Prunus lannesiana Wils.) was investigated in the Izu peninsula. By the beginning of July, the floral primordium had already been formed. Afterward, the calyx lobe was formed at the beginning of September, the petal at the beginning of October, and the stamen in the middle of October. During late November, the ovule was formed. After the petal was formed, the difference in floral bud formation was confirmed by the year and place. After the flower bud was completed, the growth of the floral bud was classified into eight stages in externals. The influence of the average temperature was suggested in floral bud formation. Buds in which green seems to crack require even, full-blooming on 32 days or more. One bud kept flowering for 14 days or more. We confirmed that floral buds with different stages existed together on the same observation day. It was thought that the flowering period of ‘Kawazu-zakura’ was long because the flowering period of one floral bud was long, and floral buds in a different state flowered continuously.