Centaurea biebersteinii Dc.
SPOTTED KNAPWEED
  Dicotyledoneae   Asteraceae   Centaurea

Centaurea biebersteinii
© Copyright Peter Burn 2011 · -1
Centaurea biebersteinii

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Centaurea biebersteinii, _flower.JP80279_51.320.jpg
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Centaurea biebersteinii, flower
JP80279_51
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Names
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FamilyScientific name @ source (records)
Megachilidae  Pseudoanthidium nanum @ AMNH_BEE (8)

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&pull 20q v4.662 20091102: Error 301 Moved Permanently http://www.nps.gov/plants/alien/fact/cebi1.htm

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Centaurea maculosa Lam.

Centaurea maculosa plant

Family - Asteraceae

Stems - To 1.5m tall, erect to reclining with age, herbaceous, branching, multiple from base, from taproot, arachnoid pubescent above, slightly scabrous, striate.

Centaurea maculosa stem

Leaves - Main cauline leaves alternate, deeply pinnatifid, (many lobes divided again), to +/-12cm long, +/-7cm broad. Ultimate divisions mucronate, scabrous, entire, oblong. Leaves in upper portions of stem greatly reduced, mostly undivided, scabrous, typically arachnoid pubescent, mucronate, linear to oblong.

Centaurea maculosa leaf Main cauline leaf.

Basals.

Inflorescence - Single flower head terminating stem in a loose paniculiform arrangement of the upper 1/2 of stems.

Involucre - To 1.2cm tall(long), 7-8mm in diameter, ovoid to slightly urcreolate in shape. Phyllaries with prickle tips, imbricate, with some arachnoid pubescence, dark brown to black in upper half, green in lower half. Margins pectinate.

Centaurea maculosa involucre Involucre.

Ray flowers - Absent.

Disk flowers - Outermost flowers enlarged, sterile, 5-lobed. Lobes to 8mm long. Innermost flowers 5-lobed, whitish to pinkish, fertile. Lobes to 4mm long. Anthers pinkish-rose, exserted, connate around style, 2-3mm long. Achenes to 3.5mm long, brown to blackish in fruit, ridged, glabrous to sparse pilose. Pappus of short bristles to 2mm long.

Centaurea maculosa flower

Flowering - June - August.

Habitat - Waste ground, rocky ground, roadsides, railroads.

Origin - Native to Europe.

Other info. - This plant is considered a pest almost every place it grows outside of cultivation. It is most common in the southern and especially the southwestern portions of Missouri.
At first glance the large sterile disk flowers appear to be ligules, but a quick second look will prove otherwise. The plant grows tall and gets very thin and open, much like in the large picture above.

Photographs taken at Logan Creek, Reynolds County, MO., 6-20-03.


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You are here: Home / Plant Profile

Centaurea stoebe L. ssp. micranthos (Gugler) Hayek
spotted knapweed

Image of Centaurea stoebe ssp. micranthos

General Information
Symbol: CESTM
Group: Dicot
Family: Asteraceae
Duration: Biennial
Perennial
Growth Habit : Forb/herb
Native Status : CAN   I
HI   I
L48   I
Data Source and Documentation
About our new maps
Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   

Images

click on a thumbnail to view an image, or see all the Centaurea thumbnails at the Plants Gallery

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory . United States, VA. Usage Requirements .

©Elaine Haug. Provided by Smithsonian Institution, Department of Botany . United States, VA, Woodbridge, Occoquan National Wildlife Refuge. Usage Requirements .

Patrick J. Alexander. Usage Requirements .

Patrick J. Alexander. Usage Requirements .

Patrick J. Alexander. Usage Requirements .

©Jim Stasz. Usage Requirements .

©Lawrence S. Gilliam. United States, NC, Forsyth Co., disturbed dry field margin. June 23, 2004. Usage Requirements .

©Lawrence S. Gilliam. United States, NC, Forsyth Co., disturbed dry field margin. June 23, 2004. Usage Requirements .

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 558. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .

slideshow

Synonyms

Symbol Scientific Name Other Common Names
ACMA9 Acosta maculosa auct. non (Lam.) Holub
CEBI2 Centaurea biebersteinii DC. spotted knapweed
CEMA4 Centaurea maculosa auct. non Lam.

Classification

Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Asteridae
Order Asterales
Family Asteraceae ⁄ Compositae – Aster family
Genus Centaurea L. – knapweed
Species Centaurea stoebe L. – spotted knapweed
Subspecies Centaurea stoebe L. ssp. micranthos (Gugler) Hayek – spotted knapweed

Subordinate Taxa

This plant has no children

Legal Status

Noxious Weed Information
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all Federal and State Noxious Weeds .
Arizona Centaurea maculosa spotted knapweed Prohibited noxious weed spotted knapweed Restricted noxious weed
California Centaurea maculosa knapweed A list (noxious weeds)
Colorado Centaurea maculosa spotted knapweed B list (noxious weeds)
Connecticut Centaurea biebersteinii spotted knapweed Invasive, banned
Idaho Centaurea maculosa spotted knapweed Noxious weed
Massachusetts Centaurea biebersteinii spotted knapweed Prohibited
Montana Centaurea maculosa spotted knapweed Category 1 noxious weed
Nebraska Centaurea maculosa spotted knapweed Noxious weed
Nevada Centaurea maculosa spotted knapweed Noxious weed
New Mexico Centaurea maculosa spotted knapweed Class A noxious weed
North Dakota Centaurea maculosa spotted knapweed Noxious weed
Oregon Centaurea maculosa spotted knapweed "B" designated weed spotted knapweed Quarantine
South Dakota Centaurea maculosa spotted knapweed Regulated non-native plant species
Utah Centaurea maculosa spotted knapweed Noxious weed
Washington Centaurea biebersteinii spotted knapweed Class B noxious weed spotted knapweed Noxious weed seed and plant quarantine
Wyoming Centaurea maculosa spotted knapweed Noxious weed

Wetland Status

Interpreting Wetland Status

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (CESTM)
Integrated Taxonomic Information System (ACMA9)
Integrated Taxonomic Information System (CEBI2)
Integrated Taxonomic Information System (CEMA4)
Jepson Interchange (University of California - Berkeley) (CESTM)
University of Washington Burke Museum (CESTM)
University of Wisconsin - Stevens Point Freckmann Herbarium (CESTM)
Related Websites
AK-Alaska Committee for Noxious and Invasive Plants Management (CESTM)
CT-Connecticut Botanical Society (CESTM)
CT-USDA NRCS Invasive Species Identification Sheets (CESTM)
Canada-British Columbia-Pest Management (CESTM)
Canada-Rangeland Ecosystems and Plants (CESTM)
Cooperative Agriculture Pest Survey & NAPIS Page (CEBI2)
Global Invasive Species Database (CESTM)
ID-Idaho One Plan Noxious Weeds (CESTM)
Invasive Species (CESTM)
MA-Massachusetts Non-Native Plant Introductions (CEBI2)
MI-Department of Environmental Quality (CESTM)
MO-Missouri Plants (CESTM)
NAPIS Pest Tracker (CESTM)
NC-Plant Fact Sheet (CESTM)
ND-Know Your Knapweeds (NDSU Extension) (CEBI2)
ND-North Dakota State University Extension (CESTM)
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)
USDA FS-Common Control Measures for Invasive Plants of the Pacific Northwest Region (CESTM)
USDA NAL-National Invasive Information Center (CESTM)
USDA NRCS Plant Materials (CEBI2)
USDA NRCS-Montana Invasive Species Technical Notes (CESTM)
VA-Invasive Alien Plant Species of Virginia (CESTM)
VA-Virginia Tech Weed Identification Guide (CESTM)
WA-State Noxious Weed Control Board (CESTM)
WI-Department of Natural Resources (CESTM)
WI-Invasive Plants of Wisconsin (UofWI-Green Bay) (CESTM)
Weed Technology Article (CESTM)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover


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Number of matches : 9
Query: SELECT * FROM img WHERE ready=1 and taxon like "Centaurea biebersteinii%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Centaurea biebersteinii
Centaurea biebersteinii
Spotted Knapweed
ID: 0000 0000 0105 0434 [detail]
© 2005 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
Spotted Knapweed
ID: 0000 0000 0105 0435 [detail]
© 2005 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
ID: 0000 0000 0506 1455 [detail]
© 2006 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
ID: 0000 0000 0506 1458 [detail]
© 2006 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
ID: 0000 0000 0408 1495 [detail]
© 2008 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
ID: 0000 0000 0408 1496 [detail]
© 2008 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
ID: 0000 0000 0408 1497 [detail]
© 2008 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
ID: 0000 0000 0408 1498 [detail]
© 2008 Louis-M. Landry

Centaurea biebersteinii
Centaurea biebersteinii
ID: 0000 0000 0408 1499 [detail]
© 2008 Louis-M. Landry

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