Glabrous shrubs or small trees; branchlets often with prominent annular scars from fallen leaves. Leaves completely sheathing stems at base, usually concolorous, parallel-veined. Flowers bisexual, glabrous, in terminal spikes or panicles; individual flowers subtended by 0–several persistent or caducous bracts and/or bracteoles; corolla ovoid, ellipsoid or conical, ± closed at apex, not separating into lobes but splitting transversely near the base, the upper part (operculum) shed, the lower cup-like part persisting; stamens 4 or 5, free from corolla; filaments inserted at base of ovary, often persistent until fruiting; nectary absent or of indistinct scales; ovary 5-locular, with many ovules per locule, style filiform, inserted in a depression between the carpels. Fruit a loculicidal capsule.
Endemic Australian genus of 11 species.