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Perennial herb. Stems slender, erect, sparsely hairy at nodes, brittle, 30-90 cm tall, arising from a branched woody stock with persistent lf bases. Lvs pinnate; lamina 5-15 × 5-12 cm; lateral leaflets in 3-(5) pairs, ovate to elliptic, obtuse, bicrenately lobed, each usually with a basal proximal ± deflexed pinnule or lobe; midrib and petiolules narrowly winged; wing expanded at bases of petiolules; terminal leaflet ternate; petiole 1/4-1/2 length of, or rarely =, lamina. Peduncles 2-10 cm long; umbels 2-6-flowered; pedicels 1-5 cm long. Sepals c. 8 × 5 mm, obovate. Petals yellow, obovate, up to 1 cm long. Capsule linear, somewhat constricted between seeds, 20-50 × 1.5-2 mm.
A small plant that grows for 2 or more years. It grows 90 cm high and spreads 50 cm wide. The stem is slender, smooth and swollen at the joints. It branches from the base. The leaf stems are brittle. The leaves have leaflets along the stalk. The end leaflet often has 3 lobes. The flowers are golden-yellow. They are 25 mm wide and have 4 petals. They are in loose clusters at the ends of the branches. The fruit are slender pod-like capsules. They are 5 cm long. The seeds are black and kidney shaped.
Plants to 10 dm. Stems branching, ribbed. Leaves to 35 cm; petiole 2-10 cm; blade deeply 5-9-lobed; margins irregularly dentate or crenate, rarely laciniate. Inflorescences: peduncle 2-10 cm. Flowers: pedicels 5-35 mm; sepals to 1 cm; petals bright yellow, obovate to oblong, to 2 cm wide; style ca. 1 mm. Capsules linear to narrowly oblong, 2-5 cm, glabrous. Seeds black, reticulate-pitted.
Branched, 3–8 dm; cauline lvs several, alternate, much like those of Stylophorum diphyllum; sep glabrous; pet 1 cm; fr 3–5 cm; 2n=12. Eurasian sp., well established in moist soil from Que. to Io., s. to Ga. and Mo. Apr.–Sept.
