Dipsacus fullonum
Family: Caprifoliaceae
common teasel, wild teasel
Dipsacus fullonum image
Stephen L. Solheim  
Etymology: Dipsacus: from the Greek dipsa, "thirst," from the connate (joined or attached) leaf bases that in some ssp. hold water
Plants: erect, biennial, 2'-7' tall forb; stems prickly
Leaves: stem leaves lance-shaped, up to 12" long, toothless towards the top, bases surround the stem
Flowers: purple to white, 4-parted, with irregular petals; inflorescence a dense, cylindrical cluster on a long, naked stalk, some of the bracts taller than the flower cluster; blooms July-Sept.
Habitat: moist; roadside, disturbed areas
Invasiveness: Restricted Invasive - Eradicate!
Conservation Status: Introduced - naturalized; ecologically invasive