common teasel, wild teasel
[Dipsacus fullonum f. albidus L.]
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
Floristic Rating: Wetland Indicator = NI WIS DNR-Bureau of Endangered Resources: Detailed information on Wisconsin invasive species including decription, habitats, control methods USDA Plants Database: Federal Distribution and detailed information including photos University of Wisconsin - Green Bay: Invasive Plants: Photos, descriptions, information Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"