一、美国大杏仁(扁桃) 美国大杏仁是蔷薇科扁桃属果树,又名巴旦杏和扁桃。是一种仁用桃,坚果类木本油料树种。为落叶乔木,树干和多年生枝树皮黑褐色。一年生枝下垂、绿色。叶光滑,淡绿色,有托叶,披针形或长椭圆形。树的外貌与杏相似。果实圆或圆柱形,先端钝或尖,绿色有淡红色晕,成熟后果皮干燥开裂,内果皮中含核仁1～2粒。一般4月上旬开花,8月下旬成熟。树体有许多旱生结构和发达的根系,耐旱力很强,耐 First, the United States almonds (almonds) The United States almonds is Rosaceae Almond trees, also known as almonds and almonds. Is a kind of peach, nutty woody oil tree species. Deciduous tree, trunk and perennial bark dark brown. Annual branches drooping, green. Leaves smooth, light green, with stipules, lanceolate or oblong. Tree looks similar to apricot. Fruit round or cylindrical, apex obtuse or sharp, green, reddish halo, peel ripening cracking, endocarp containing 1 to 2 kernels. Generally flowering in early April, mature in late August. Tree has many xerophytic structure and well-developed roots, drought-resistant and strong resistance