Pacific Starflower (Lysimachia latifolia)
Something has been nibbling on the leaves. In the shade of the redwoods along San Francisquito Creek, Herb Dengler Trail (Trail 1), 1:58 pm. Formerly called the western starflower (Trientalist latifolia). It doesn't care what you call it. Pretty double flowers, one with 6 petals, one with 7.