Family: Asteraceae
spotted knapweed
[Acosta maculosa auct. non (Lam.) Holub, more...]
Merel R. Black
Merel R. Black
University of Wisconsin - Madison (WIS-VP)
Etymology: Centaurea: ancient Greek plant-name, poetically associated with Chiron, the Centaur, but without wholly satisfactory explanation
Plants: erect, biennial/perennial, 1'-4' tall forb
Leaves: pinnately-divided with narrow lobes
Flowers: head 1" wide with pink to purple disk flowers, starry, loosely thistle-like, bracts (phyllaries) fringed with black "eyelashes"; inflorescence a solitary head at the ends of the many branches; blooms June-Oct.
Habitat: dry; disturbed sites; in limy soil
Invasiveness: Restricted Invasive - Eradicate!
Conservation Status: Introduced - naturalized; ecologically invasive
Plants: erect, biennial/perennial, 1'-4' tall forb
Leaves: pinnately-divided with narrow lobes
Flowers: head 1" wide with pink to purple disk flowers, starry, loosely thistle-like, bracts (phyllaries) fringed with black "eyelashes"; inflorescence a solitary head at the ends of the many branches; blooms June-Oct.
Habitat: dry; disturbed sites; in limy soil
Invasiveness: Restricted Invasive - Eradicate!
Conservation Status: Introduced - naturalized; ecologically invasive
Flora of North America: Flora of North America Invasive And Exotic Species of North America: Descriptions, management issues, warnings, photos, etc. 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 Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key
Merel R. Black
Kenneth J. Sytsma
Christopher Noll
Merel R. Black
Kenneth J. Sytsma
Robert Bierman
Paul Drobot
Margery Melgaard
Josh Sulman
Matthew L. Wagner
Josh Sulman
Paul Drobot
Christopher Noll
Josh Sulman
Botancial Illustration
