Bouncing Bet
Saponaria officinalis

Family: Pink (Caryophyllaceae)
AKA: Soapwort
Photo taken on: July 31, 2011
Location: Wet Mountains, Eastern CO
Life Zones: Plains and foothills
Habitat: Disturbed areas, roadsides

Grows to 3ft in dense colonies with sturdy branching stems. Leaves are smooth and narrow. Flowers are white to pinkish and grow in clusters at the ends of the branches. An escaped ornamental that has become a noxious weed.

Flora of North America reference.