American bugbane, bugbane, mountain bugbane, mountain rattle-top, summer cohosh.
A perennial shrub that grows to 3 to 4 feet in height. The plant resembles C. racemosa (L.) Nutt but is not as tall; and it has shorter lateral spikes of small, white flowers plus a terminal spike.
July to September.
Rhizomes and roots at end of growing season.
This plant is used as a antispasmodic in some areas. (See C. racemosa.)