Herb to about 80 cm tall. Flowers erect, pale to dark blue. Sepals 2-4 cm long, blue, spreading. Petals white, spurs 3-5 cm long, narrow, straight, blue; late spring. Stamens not protruding from flower. Fruit follicles hairless.
W North America
Variable and with a range of cultivars including 'Kristall'.
Source: (1997). Ranunculaceae. In: . Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.