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.
Polygonatum verticillatum 'Rubrum':
Tall upright dark-red stems with whorls of narrow leaves and bell shaped flowers flushed red. Good in shade. Hardy. Up to 1m.