Seen at the Reader Rock Garden, Calgary. Crowfoot family, Ranunculaceae.

"An excellent plant for the rock garden, and in spring, produces large, buttercup-like, yellow flowers, borne above finely divided, fern-like foliage. Adonis is self-seeding, pollinated by bees, flies and beetles. A fully hardy, clump-forming perennial, it thrives in an open, well-drained site, tolerating some shade, with moist, humus-rich soil. It is an ornamental plant that is often seen in woodland settings and cultivated beds." Thanks to BBC.co.uk gardening website.