Caulophyllum thalictroides (Blue cahosh):
Shade-loving with yellow-brown flowers in spring, followed by blue berry-like seeds in autumn. Attractive, divided blue-grey foliage. Hardy. Up to 1m.
Bright yellow flowers emerge from attractive papery buds. Prefers a well-drained soil and a sunny spot. Attractive to bees. Hardy. Up to 90cm.