Fig. (1) Anatomical changes in the flower bud during differentiation and development in ‘Jinsi No.4’ jujube. A, Longitudinal section showing the period of pre-differentiation in early April. B, Longitudinal section showing the initial stage. C, Longitudinal section showing the period of sepal differentiation. D-E, Longitudinal section showing the period of petal differentiation. F-G, Longitudinal section showing the period of stamen differentiation with petal, sepal and stamen. H-J, Longitudinal section showing the period carpel differentiation with petal, sepal, stigma, filament, anther and ovary. K-L, Longitudinal section showing the inflorescence differentiation with f0, f1 and f2. an: anther; s: sepal; sti: stigma; p: petal; st: stamen; c: carpel; o: ovary. fi: filament. f0, f1 and f2 represent 0, 1 and 2 level flowers of inflorescence, respectively.