Cotinus

The term "smoke tree" commonly refers to ornamental species of small trees or shrubs in the genus Cotinus. These plants, belonging to the cashew family (Anacardiaceae), are deciduous and known for their foliage or flowers that resemble clouds of smoke. The airy inflorescences are formed by the colored stalks of sterile flowers, creating a smoky appearance that can range from red to pale yellow or cream.1

Two main species are recognized: Cotinus coggygria, native to Eurasia, and Cotinus obovatus, found in North America. Both have attractive fall foliage and produce fleshy, lopsided fruits. C. coggygria has oval leaves, while C. obovatus has egg-shaped leaves and is sometimes called chittamwood.12

A spiny shrub from the pea family, Psorothamnus spinosus, is also sometimes called a smoke tree.1