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Annual herb, usually procumbent, or else up to 0.6 m high; hispid. Leaves pinnately compound, resembling carrot leaves. Inflorescences: umbels mostly lateral, leaf-opposed, compound with 2 or 3? rays; peduncles < 25(-50) mm long (significantly shorter than petioles); involucre absent. Rays very short, concealed by flowers or fruit. Calyx of 5 small, acute teeth, persistent. Petals obovate, emarginate, with inflexed point, white, larger on outside flowers than on inner ones. Flowering time Sept.-Dec. Fruit grooved at sides, covered with stiff, straight bristles; mericarps circular in section, without ridges.
Distinguished by the lateral umbels, very short rays and the presence of heteromorphic mericarps (inner tuberculate, outer spiny) and larger, less numerous spines.
A herb.
