Arctium lappa L.
Family: Asteraceae
great burdock
Arctium lappa image
Janice Stiefel  
Etymology: lappa = burdock
Plants
: erect, biennial, 3'-9' tall forb

Leaves
: alternate, large, heart-shaped base, on stalks getting shorter toward the top, lower stalks almost solid

Flowers
: head up to 1 1/2" wide with pink to purplish disk flowers, bracts (phyllaries) with hooks curving inward; inflorescence a cluster of long-stalked heads; blooms Aug.-Oct.

Fruits
: round, bristly, 1/2" clinging bur (inspiration for Velcro)

Habitat
: roadsides, disturbed sites

Conservation Status
: Introduced - locally established
Similar to A. minus, but with larger glabrous heads 3-3.5 cm wide, 2.5-3 cm high, on long peduncles in corymbose inflorescences. 2n=32 (Darlington 1955).

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.

Native of temperate Eurasia, collected only 11 times in Wisconsin: first collections from (1) Iowa Co.: Roadside, July 27, 1961 [fl], Brady & Maduewesi s.n. (WIS). and (2) Lincoln Co.: Abandoned farm, Harrison Twp. Seymour 12693 (WIS).

Online Virtual Flora of Wisconsin. 2016. http//:wisflora.herbarium.wisc.edu. Accessed on December 27.

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.