Lettuce-leaf Saxifrage
Micranthes micranthidifolia
 
Also called Brook Lettuce. An occupant of rocky woods, stream banks, and moist cliffs in the wild, Lettuce-leaved Saxifrage has delicate and airy white flowers that bloom in spring.

Light: Part Shade
Soil Moisture: Medium to Wet
Height: 2-3 ft
Spread: 2 ft
Bloom Time: May-June