Filipendula ulmaria
Family: Rosaceae
Filipendula ulmaria image
Stephen L. Solheim  
Etymology: Filipendula: Latin filum for "thread" and pendulus for "hanging," referring to small tubers strung together by fibrous roots of one species
Plants: erect, perennial, 3'-7' tall forb
Leaves: once pinnately-divided, side leaflets doubly- toothed; end leaflet round in outline to 2"-6" wide, deeply cut into 3-5 parts
Flowers: white, 5-parted, 1/8"-1/3" wide, circle of 5-15 pistils; inflorescence a branched, dense cluster (panicle) of stalked flowers; blooms June-Aug.
Fruits: dry, smooth seed spiraling about half a turn
Conservation Status: Introduced - rarely escaped; potentially invasive