Report a Sighting. Spotted Knapweed was formerly (or incorrectly) known as Centaurea biebersteinii and Centaurea maculosa. Seeds have short bristles (pappus) on one end. Spotted Knapweed is one of 3 targeted plant species in Minnesota with an active bio-control program, the other 2 species are leafy spurge and purple loosestrife. Spotted knapweed is primarily a weed of pastures, hayfields, roadsides, and sometimes turfgrass. Description: Spotted Knapweed is a biennial or short-lived perennial with several branched, upright stems growing from a stout taproot and usually grows up to 3 feet tall. Centaurea stoebe, the spotted knapweed or panicled knapweed, is a species of Centaurea native to eastern Europe. A study by Kelsey and Mihalovich (1987) found that spotted knapweed collected before flowering contained neutral detergent fiber (24.2-53.0% in dry weight), ether extract (3.1-9.0%), crude protein (6.2-18.2%), total non-structural carbohydrates (11.0- 27.5%), ash (4.9 to 9.3%), in vitro dry … Invasive Plants in Pennsylvania: Black, Brown and Spotted Knapweed (PDF | 1.2 MB) Pennsylvania Department of Conservation and Natural Resources. NUTRIENT VALUE The rosettes and young flowers of spotted knapweed have some nutritive value. Spotted knapweed is a prolific seed producer, with individual plants producing up to 140,000 seeds per square metre. Seedlings Cotyledons round at the apex and narrowing to the base. Spotted—pink to purple finely dissected compound daisy flowers with black fringe; June to September. Fruit/Seed Description: Seeds are 0.1 inch (2.5 mm) long, black or brown and oval. micranthos (Gugler) Hayek (Aster family, Asteraceae) Description . It is also an invasive species in the United States, and particularly widespread in dryer regions of the Pacific Northwest. Spotted & Diffuse Knapweed Centaurea biebersteinii, Centaurea diffusa. Spotted & Diffuse Knapweed. Spotted knapweed typically forms a basal rosette of leaves in its first year and flowers in subsequent years. See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands Weed Description A biennial or occasionally perennial that forms a basal rosette during the first year of growth and produces a flowering stem during the second year. Its name is derived from the spots formed by black margins on the flower bract tips. State designated noxious weed. Rosettes are formed the first year and appear in early spring as deeply lobed leaves radiating from a common Height to 4 ft.; rosette first year. Spotted Knapweed Centaurea stoebe L. ssp. Stem Description: Spotted knapweed stems are upright and branched, with larger plants being more branched than smaller plants. ND-Spotted Knapweed (NDSU Extension) (CEBI2) NJ-Rutgers Cooperative Extension (CEBI2) OH-Ohio Perennial and Biennial Weed Guide (CESTM) PA-Pennsylvania Flora Abstract (CESTM) Plant Conservation Alliance-Alien Plant Working Group (CESTM) TNC-Global Invasive Species Initiative (CESTM) USDA FS Fire Effects Information System (FEIS) (CESTM) Description. DESCRIPTION Spotted knapweed is a biennial or short-lived perennial. Seeds and plant fragments make their way into hay and the undercarriages of vehicles, allowing for new infestations over great distances.
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