queen-of-the-prairie

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A rhizomatous perennial plant (Filipendula rubra) in the rose family, native to eastern and central North America, having aromatic, pinnately compound leaves and showy panicles of small pink flowers.

from The Century Dictionary.

• noun A tall American herb, Spiræa lobata, of meadows and prairies in the interior.