Spreading or erect shrub or tree to 8 m high.
Leaves simple, linear to obovate, 1–15 cm long, 1–40 mm wide, apex obtuse to acuminate, base attenuate to cuneate, margins entire to irregularly sinuate or toothed, glabrous; sessile or petiolate.
Flowers in terminal panicles; pedicels 3–9 mm long. Sepals 3 or 4, lanceolate to ovate, not persistent. Ovary pubescent or glabrous.
Capsule (for all taxa except for subsp. viscosa) 3- or 4-winged, 8.5–28 mm long, 11–28 mm wide, glabrous; wings 3–10 mm wide.