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Leaves with a petiole to 2 cm long; stipules glandular; lamina to 11 × 5 cm, obovate, rounded at the apex, cuneate at the base, entire, glabrous, or occasionally with a few long spreading hairs on the petiole and lower margins.
Spineless shrub, up to 1.5 m high. Branches herbaceous when young, becoming woody and hollow with age, repeatedly forked or whorled. Leaves scattered or whorled near ends of branches, up to 150 mm long. Flowers green.
Cymes in 3(5)-branched umbels on peduncles to 15(19) cm long, from whorls of 4–7 leaves at the branch apices, with primary rays to 10 cm long, each forking usually once only.
Seeds c. 5.5 × 4 mm, ovoid with an acute apex, surface sparsely covered with large flattened warts, brownish-grey.
Female flower: styles 3.5–4.5 mm long, joined to halfway, erect with slightly spreading very shortly bifid apices.
Male flowers: bracteoles few, strap-shaped, ciliate on upper margins and deeply divided; stamens 4 mm long.
Bracts c. 1.5–2 mm in diameter, ovate to suborbicular, subsessile to shortly petiolate, glabrous.
Capsule exserted on a pedicel to 6 mm long, 8 × 10 mm, deeply 3-lobed with a sunken apex.
Shrubby perennial herb to 1.2 m high, with softly woody stems and branches.
