Variation
var. ludlowii
This vigorous deciduous shrub grows to 2.2 m (7 ft) tall and wide with bright green divided leaves forming a rounded habit. During late spring to early summer it produces large bright yellow single saucer-shaped flowers. It grows in an open sunny to partially shaded wind protected position in organic rich well-drained soils that a tending alkaline in USDA zones 5-9.