Stamens in one species 4 and opposite the calyx lobes, in the other species (5) 6–8 (10), anthers without appendages, in some species connate, in others free, opening by narrowly elliptical pores on the outer side of the upper part of each lobe.
Leaves in whorls of 3 or 4, very small, the outer margins reflexed, normally to such an extent that they meet along the mid–line of the under side of the leaf, forming a sulcus; often glandular at the tip and along the apparent margin.
Calyx with one sepal longer than the others, and this sepal usually free and leaf–like at the tip, other sepals connate to a variable extent, sometimes leaf–like at the tip.
Calyx and corolla hypogynous, 4–partite, occasionally 3–partite in some flowers, regularly 3–partite in some species not in the F.Z. region.
Flowers small, in capitate clusters of up to about 12 flowers, but usually fewer, at the tips of the branchlets.
Fruit a cartilaginous loculicidal capsule contained within the persistent calyx and corolla.
Corolla actinomorphic, campanulate to urceolate, not deeply cleft, lobes obtuse.
Much branched trees or shrubs with flexuously ascending stems.
Ovary 3–4–locular, placentation axile.
Pedicels without bracts.
Branchlets slender.