Go Botany says Early Blue Cohosh flowers before the leaves are 'expande.' This plant was fully leaved out.
Beginning of anthesis for species. Abundant in scattered patches regardless of slope orientation.
Caulophyllum thalictroides, blue cohosh a species of Caulophyllum (family Berberidaceae), also called squaw root or papoose root, is a flowering plant in the Berberidaceae (barberry) family. It is a medium-tall perennial with blue berry-like fruits and bluish-green foliage.