The most visible flower parts of delphinium nuttallianum
are the sepals; 5 of them, with the top one having a lighter-colored spur up to one inch long; a characteristic of all species of larkspur. At the flower center are 4 petals, the uppermost two pale blue or white. Flowers are quite widely spaced and relatively large, borne on the end of short secondary stalks (pedicels), branching off the single main stalk. Flower color ranges from purple to light blue.