Potentilla gracilis (Slender or Graceful Cinquefoil)
Just as the common name says, this plant produces a graceful 1' mound of lacy fretted palmate foliage with sunshine yellow flowers. In western Oregon, it is a key species in both our wet and dry prairies and its long bloom-time in June attracts numerous native pollinators.
This native buttercup blooms April through mid-May and is an early shining star of our prairies. Very persistent due to self-sowing. It also makes a nice addition to native gardens giving our native bees important resources early in the season.
Curvpod yellowcress is found throughout the west in a variety of wet habitats. In our prairie habitats, it is found with other annuals in areas with low cover of other vegetation such as vernal pools. In mild winters, it can act as a biennial.