梓树（学名：Catalpa ovata）是紫葳科梓属的植物。

落叶乔木；宽卵形或圆卵形的大叶子3枚轮生或对生，3－5浅裂或全缘，无毛或微有毛；夏初开浅黄色二唇形花，圆锥花序顶生；蒴果细长；扁平种子多数，两端有长毛。

Catalpa ovata, the yellow catalpa or Chinese catalpa (Chinese:梓; pinyin:zǐ), is a pod-bearing tree native to China. Compared to C. speciosa, it is much smaller, typically reaching heights between 20 and 30 feet. The inflorescences form 4–10-inch-long (100–250 mm) bunches of creamy white flowers with distinctly yellow tinging; individual flowers are about 1 inch wide. They bloom in July and August. The leaves are very similar in shape to those of Paulownia tomentosa, having three lobes (two are abruptly truncated on either edge, with a third, central, slightly acute, pointed lobe forming the leaf apex), and are darkly green. Fruits are very narrow, foot-long pods.