The pasque flower, so named because it blooms around the time of the Jewish passover, is another harbinger of Spring in the Rockies.
Time lapse of a Japanese Toad Lily [Tricyrtus sp.] blossoming. There are two video clips of separate flowers - one from the side, another from above. These flowers are quite small - only about 3 cm across when fully open.
Although this week's weather has buried everything in snow again for a few days, we got a taste of Spring last weekend, with Crocus chrysanthus in bloom:
More photos added 14 April: