Marsh Checker Mallow
Sidalcea ranunculacea
Malvaceae
Sildalcea - from Gr. Sida, a nymph; side, a water plant
ranunculacea - from L. rana, like Ranunculus (genus name meaning little frog)
lower leaves circular; upper leaves becoming lanceolate
endemic to California
prefers moist areas - photographed in Holey Meadow, FR 23S06