The Dawes Arboretum

Common name: blue cohosh

Family: Berberidaceae (barberry family)

Synonym: Leontice thalictroides

Distribution: c. and e. North America

Habitat: Mesophytic forests; 0-1200 m

Hardiness: USDA Zone 4

Life form: Herbaceous perennial

Comments: Blue cohosh is often found in forests on shady hillsides or ravines growing between 1-3 feet tall. The foliage has a distinctive bluish green cast and the shape of the leaflets is reminiscent of meadow-rue (Thalictrum), hence the species name. The flowers, which bloom in April, are somewhat inconspicuous and vary from yellowish green to purplish brown. This plant is more valued for its clusters of blue grape-like fruits that follow the flowers. Native Americans used blue cohosh as a medicinal herb. Bees are attracted to the flowers because of the fleshy nectar glands on the petals. Animals and birds likely aid in seed dispersal.