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Leaves often lobed or divided, and the inflorescence frequently scorpioid.

Leaves mostly entire and plants often rough-hispid; inflorescence commonly scorpioid.

Nutlets erect and straight, unarmed, attached to the axis either at inner edge of base or ventrally from the base upward.—Ours are very hispid annuals or biennials, with small white flowers in scorpioid spikes.

Fruit 2-lobed, separating into two 2-celled 2-seeded carpels, with sometimes a pair of empty false cells; style very short; flowers in bractless scorpioid spikes.

Scorpioid, incurved like the tail of a scorpion; said of an inflorescence.