They are medium-sized deciduous trees growing to 10–20 m (33–66 ft) tall, with spirally arranged pinnate or bipinnate leaves. The flowers are small and yellow, produced in large branched panicles 20–50 cm (8–20 in) long. The fruit is a three-lobed inflated papery capsule 3–6 cm long, containing several hard nut-like seeds 5–10 mm diameter.
Koelreuteria are commonly used as focal points in landscape design in regions where they thrive.
In some areas, notably parts of eastern North America, they have become invasive species.
Media related to Koelreuteria at Wikimedia Commons