Q: What is this yellow-flowered, ferny-leaved plant in my rock garden?
A: After consulting with the Hyde Herbarium, we can confidently identify this as Corydalis cheilanthifolia. The North American Rock Garden Society website has a good picture of it in the same stage of growth in a Calgary, Alberta garden. It’s the yellow-flowered one in front. That pink flower in the back looks like a tall type of primrose, perhaps Primula saxatilis.