Ridolfia segetum (L.) Moris , it is an annual herb, erect, up to 25-80 (-100) cm tall, glabrous, glaucous, dichotomously branched with terete. obscurely sulcate stems. Leaves triangular-ovate, 5-25 (-30) x 4-20 cm, deeply pinnatisect into filiform setose, 5-30 x 0.5-1 mm, acute ultimate segments; lower leaf petioles 10-15 cm or more long; upper leaves sessile, ternately divided into filiform segments or reduced to the inflated petioles. Umbels (10-) 25-50 (-60)-rayed, on up to 2 cm long peduncles; rays slender, sub equal 2-8 cm long, up curved from a patent base. Umbellules 30 or more-flowered. Pedicels 1.5-5 mm long at anthesis lengthening up to 10 mm in fruit. Petals oblong, 0.8 mm long, yellow, emarginate-truncate at the strongly inflexed apices. Anthers suborbicular, yellow. Fruit narrowly oblong to prismatic, 1.5·2 x c. 1.2 mm, dark greenish-brown; mericarps glabrous, ribs filiform, obscure.
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