梧桐（学名：Firmiana simplex），又名青桐、桐麻，是梧桐科的一种落叶乔木，它和同名为“桐”的油桐(大戟科)、泡桐（泡桐科）、法国梧桐(悬铃木科)没有亲缘关系。

梧桐树高大魁梧，树干无节，向上直升。树皮平滑翠绿，树叶浓密，从于到枝，一片葱郁，显得清雅洁净，难怪人们又叫它“青桐”。“一株青玉立，千叶绿云委”，这两句诗，把梧桐的碧叶青干，桐荫婆娑的景趣写得淋漓尽致。

梧桐是落叶乔木，高可达12米；它喜光，喜深厚湿润土壤。幼树皮绿色，平滑；叶子掌状3-7裂；夏季开淡黄绿色小花，圆锥花序；果实分为5个分果，分果成熟前分裂呈小艇状，种子生在其边缘。它喜光，喜深厚湿润土壤，生长快。

Firmiana simplex, commonly known as the Chinese parasol tree, Chinese parasoltree, or wutong (Chinese:梧桐; pinyin:wútóng), is an ornamental plant of tree size that has recently been assigned to the family Malvaceae and was formerly the Cacao Family (Chocolate Family) Sterculiaceae in the order Malvales, and is native to Asia. It grows up to 16 m (52 ft) tall. It has alternate, deciduous leaves up to 30 cm (12 inches) across and small fragrant, greenish-white flowers borne in large inflorescences. A flowering tree varies in fragrance with weather and time of the day, having a lemony odor with citronella and chocolate tones. A tall, stately specimen grows in the botanical garden in Florence, Italy. Bumble bees and Giant Mason Bees readily visit the flowers in Maryland, U.S. People grow this tree as an ornamental in warm regions of North America.