对从美国加州引种至昆明树木园的Nonpareil和Carmel两扁桃品种的物候 ,当年生枝、花芽分化及果实发育的观测结果发现 :扁桃在昆明 2月上旬萌动生长 ,随即进入初花期 ,2月中下旬为盛花期 ,3月上旬显现幼果 ;3～ 6月为枝条生长旺盛期 ;7月中旬果实成熟。正常情况下 ,11月开始落叶。枝条生长具有两次高峰 ,分别出现在 3月中下旬和 5月下旬至 6月上旬 (2次枝 )。花芽自 4月下旬开始分化 ,经分化前期、花萼期、萼片期、花瓣期、雄蕊分化期、雌蕊分化期 ,至 7月下旬花芽形态分化基本完成。果实发育分 3个阶段 :第 1阶段为果实发育期 ,历时 30天左右 ;第 2阶段为硬核期 6 0天左右 ;第 3阶段为成熟期 2 5天左右 Observations on the phenology, current year branches, flower bud differentiation and fruit development of Nonpareil and Carmel varieties introduced from California to the Arboretum in California found that almonds started to germinate in early February in Kunming, then entered the early flowering period. In late February For the flowering period, early March showed young fruit; 3 to June for the vigorous growth of branches; fruit ripening in mid-July. Under normal circumstances, leaves began to fall in November. Branches grow with two peaks, respectively, in late March and late May to early June (2 branches). Flower buds began to differentiate from late April. The differentiation of flower buds was basically completed by the early differentiation, calyx, sepal, petal, stamen differentiation and pistil differentiation until the end of July. Fruit development is divided into three stages: the first stage is the fruit development period, which lasted about 30 days; the second stage is about 60 days of hard nuclei; the third stage is about 25 days of maturity