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Stems arising several together, relatively simple and unbranched, terete, rigid, solid and with distinct rather fine grooves, glabrous to slightly puberulous, often tinged purplish-brown.
Flowers numerous in each partial umbel on finely pubescent, regular rays; petals greenish-white to creamy-yellow.
Fruit narrowly elliptic with well-developed, obtuse ribs, densely bristly pubescent, especially before maturity.
Endosperm semi-circular in section, with blunt projections towards the broad ribs, commissural face flat.
Bracteoles similar to the bracts, sometimes withering and partially eroded in mature fruiting umbels.
Bracts 1–4 × up to 7 mm., very well developed, linear, green with a membranous margin.
A very robust perennial herb 1–2 m. high, often glaucous and sometimes sub-shrubby.
Umbels with numerous ± regular rays 3–9 cm. long, finely and densely pubescent.
Stylopodium conical; styles clubbed at the apex, reflexed in fruit.
Vittae 1 in each interval and 2 in the commissural face.
Carpophore entire or 2-cleft nearly to the base.
