 The samaras are small, and often numerous.They are small deciduous trees, typically 5–15 m tall, rarely to 20 m tall, fast-growing when young but soon slowing down with age, and often short-lived; they typically occur as understorey trees in mountain forests, often along streamsides.Some have good fall color with tones of reds and orange, while others tend toward a pale yellow which is less impressive.