There are two species of Blue Cohosh: Caulophyllum thalictroides (this one) and Caulophyllum giganteum. Caulophyllum thalictroides (the one on this page) generally has lighter greenish flowers which bloom after the leaves have opened. Caulophyllum giganteum has dark purple/red flowers which open with or before the leaves.
Origin and Meaning of Names:
Scientific Name: thalictroides: like "thalictrum"
155 photographs available, of which 7 are featured on this page. SCROLL DOWN FOR PHOTOGRAPHS.