Nasty brown flowers for ground beetles if

Photographed in my yard, where it had been planted; it has since been eradicated (i think...). Ficaria verna Hudson ssp. calthifolia (Reichenbach) Nyman

Photographed in my yard, where it had been planted; it has since been eradicated (i think...).

There are several plants along the Shepherd Nature Trail in Duke Forest, park at Gate C on NC 751. Location is approximate. Plants are between numbered stops 6 and 7 (and maybe other places too).