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Ranunculus acris
It is a somewhat hairy plant that has ascending flowing stems bearing glossy yellow flowers about 1"+ across. There are five overlapping petals borne above five green sepals that soon turn yellow as the flower matures. It has numerous stamens inserted below the ovary.
Sierra foothills, Area of critical environmental concern Red Hill, approx 1500' asl... Very harsh soil... serpentine rock
This and other buttercups contain ranunculin, which breaks down to the toxin protoanemonin, a chemical that can cause dermatitis and vomiting.