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A herb. It keeps growing from year to year. It has slender stems. It grows up to 1 m high. It has an underground rootstock covered with old leaf bases. The main leaves are near the base. There are only a few leaves and they have long stalks. The leaves have opposite pairs of repeatedly divided leaflets. There are only a few small leaves along the stem. The stems are smooth and have a few branches. The flowers are in groups at the ends of branches. Male and female flowers are on the same plant. The flowers are yellow and there are up to 20 on a stalk. The fruit have strong ribs. The fruit are oblong and 7 mm long by 3 mm wide.
Herb, 0.50-0.75 m high. Radical leaves 3-ternate, segments linear-filiform, angularly ribbed. Involucre and involucel 5-leaved. Fruits with narrow but distinct wings. Flowers yellow.
