Home Asteraceae Centaurea

Centaurea stoebe L.

Common Name: SPOTTED KNAPWEED
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad B-Forb

C. maculosa of Michigan Flora.

A Eurasian invader first collected in 1911 in an alfalfa field at Hesperia (on the Oceana/Newaygo Co. line); no collector is recorded. Now spread aggressively everywhere: old fields on poor soil, roadsides, disturbed sites, and disturbed places, especially in the northern part of the state, where it takes over open sites.

Our plants are subsp. micranthos (Gugler) Hayek, sometimes called C. biebersteinii DC. Since the introduction of C. diffusa, these two species seem to have hybridized extensively in some areas, blurring the distinctions in the key.

A. Chartier

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Counties
Alcona
Alger
Allegan
Alpena
Antrim
Arenac
Baraga
Barry
Benzie
Berrien
Branch
Calhoun
Charlevoix
Cheboygan
Chippewa
Clare
Clinton
Crawford
Delta
Dickinson
Emmet
Genesee
Gladwin
Gogebic
Grand Traverse
Gratiot
Hillsdale
Houghton
Huron
Ingham
Iosco
Iron
Isabella
Jackson
Kalamazoo
Kalkaska
Kent
Keweenaw
Lake
Lapeer
Leelanau
Lenawee
Livingston
Luce
Mackinac
Macomb
Manistee
Marquette
Mason
Mecosta
Menominee
Midland
Monroe
Montcalm
Montmorency
Muskegon
Newaygo
Newaygo or Oceana
Oakland
Oceana
Ogemaw
Ontonagon
Osceola
Oscoda
Otsego
Ottawa
Presque Isle
Roscommon
Saginaw
Schoolcraft
St. Clair
St. Joseph
Tuscola
Van Buren
Washtenaw
Wayne
Wexford

Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March, 17, 2025
https://lsa-miflora-p.lsait.lsa.umich.edu/#/record/277