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楸树(Catalpa bungei)为紫葳科梓树属落叶乔木。高可达30米,树干通直;树皮灰褐色或灰黑色,浅纵裂;小枝灰绿色,无毛。单叶对生域三叶轮生,长卵状椭圆形或三角状卵形,先端渐尖,基部圆形、楔形或平截;全缘或有裂齿;表面深绿色、无光,背面浅绿色,基脉三出,基部脉腋间具有灰褐色腺斑;叶柄浅绿色,长2～10厘米。总状花序顶生,长5～10厘米,有3～12朵上花组成;花两性,红色,内有红色斑点或条纹。蒴果,果皮灰褐色,略有光泽。种子多数,矩圆形,扁平,两端尖,具白灰色长毛,花期4～5月,果熟期9～10月。
Catalpa bungei is a deciduous tree of Catalpa bungei. Up to 30 meters high, trunk straight; bark beige or gray-black, shallowly longitudinal; twigs gray-green, glabrous. Leaves simple and simple, three-lobed ellipsoid or ovate, apex acuminate, base rounded, cuneate or truncate; entire or cracked teeth; surface dark green, matt, abaxially pale green , Three basal veins, base veins with brown-brown gland placenta; petiole light green, 2 to 10 cm long. Racemes top, long 5 to 10 cm, 3 to 12 flowers on the composition; flowers bisexual, red, with red spots or stripes. Capsule, peel grayish brown, slightly shiny. The majority of seeds, oblong, flat, pointed at both ends, with white-gray hair, flowering 4 May, fruit maturity 9 to October.