| Image |
Descriptor |
Description |
Photographer |
| 1350073 |
Biological Control |
releasing bioagents |
University of Idaho Archive |
| 5306094 |
Diagram or Graphic |
Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 558. |
USDA PLANTS Database |
| 2153083 |
Feature(s) |
Roots |
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 5358640 |
Feature(s) |
Close-up view of the flower heads of a spotted knapweed plant, Centaurea stoebe ssp. micranthos (Centaurea maculosa), showing the characteristic blackish spots on the bracts. |
L.L. Berry |
| 5374337 |
Feature(s) |
stem and leaves |
Joseph M. DiTomaso |
| 1459266 |
Feature(s) |
|
Steve Dewey |
| 1553214 |
Feature(s) |
seed head |
Ohio State Weed Lab Archive |
| 2153086 |
Feature(s) |
Unopened flower showing spots on bracts |
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 2153087 |
Flower(s) |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 2153088 |
Flower(s) |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 2153089 |
Flower(s) |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 2153090 |
Flower(s) |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 2153091 |
Flower(s) |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 1557001 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1553213 |
Flower(s) |
|
John Cardina |
| 1557003 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1459274 |
Flower(s) |
|
Steve Dewey |
| 1459916 |
Flower(s) |
|
Steve Dewey |
| 1539020 |
Flower(s) |
|
James H. Miller |
| 1539021 |
Flower(s) |
|
James H. Miller |
| 0021034 |
Flower(s) |
|
Norman E. Rees |
| 1148104 |
Flower(s) |
|
USDA APHIS PPQ Archive |
| 1196014 |
Flower(s) |
|
Michael Rasy |
| 1196030 |
Flower(s) |
|
Michael Shephard |
| 1196144 |
Flower(s) |
|
Michael Rasy |
| 1196231 |
Flower(s) |
|
Michael Shephard |
| 1350048 |
Flower(s) |
seedhead |
Cindy Roche |
| 5392027 |
Flower(s) |
Flower |
John M. Randall |
| 5392031 |
Flower(s) |
Flower |
John M. Randall |
| 5271012 |
Flower(s) |
Involucral bracts |
Leslie J. Mehrhoff |
| 5374335 |
Flower(s) |
|
Joseph M. DiTomaso |
| 5374336 |
Flower(s) |
white flower head |
Joseph M. DiTomaso |
| 5271009 |
Flower(s) |
Top of inflorescence |
Leslie J. Mehrhoff |
| 5352008 |
Flower(s) |
|
Marisa Williams |
| 2153084 |
Flower(s) |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 2153085 |
Flower(s) |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 5229081 |
Flower(s) |
|
Richard Old |
| 5229083 |
Flower(s) |
|
Richard Old |
| 5351100 |
Flower(s) |
|
Marisa Williams |
| 5352001 |
Flower(s) |
|
Marisa Williams |
| 5352002 |
Flower(s) |
|
Marisa Williams |
| 5352003 |
Flower(s) |
|
Marisa Williams |
| 5352004 |
Flower(s) |
|
Marisa Williams |
| 5352005 |
Flower(s) |
|
Marisa Williams |
| 2153081 |
Foliage |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 2153082 |
Foliage |
|
Montana Statewide Noxious Weed Awareness and Education Program Archive |
| 5374338 |
Foliage |
rosette |
Joseph M. DiTomaso |
| 1557011 |
Foliage |
|
John Cardina |
| 1557012 |
Foliage |
|
John Cardina |
| 1557013 |
Foliage |
|
John Cardina |
| 1557014 |
Foliage |
basal leaves |
Ohio State Weed Lab Archive |
| 1557015 |
Foliage |
pubescence on the underside of young leaf. |
John Cardina |
| 1553211 |
Foliage |
|
Ohio State Weed Lab Archive |
| 1553212 |
Foliage |
basal rosette |
Ohio State Weed Lab Archive |
| 1557017 |
Foliage |
basal rosette |
John Cardina |
| 1553216 |
Fruit(s) |
|
Ken Chamberlain |
| 1557016 |
Fruit(s) |
|
Ken Chamberlain |
| 1551078 |
Fruit(s) |
|
Ken Chamberlain |
| 5391592 |
Fruit(s) |
|
Barry Rice |
| 5391593 |
Fruit(s) |
|
Barry Rice |
| 5306092 |
Fruit(s) |
|
Steve Hurst |
| 5358645 |
Infestation |
Landscape view of extensive infestations of spotted knapweed, Centaurea stoebe ssp. micranthos (Centaurea maculosa), in bloom. |
L.L. Berry |
| 1624010 |
Infestation |
Native to Eurasia, is a serious problem on rangelands in the western United States. It is a particular threat to pristine natural areas such as the Grand Teton National Park. |
Carol DiSalvo |
| 5271011 |
Infestation |
|
Leslie J. Mehrhoff |
| 5271007 |
Infestation |
|
Leslie J. Mehrhoff |
| 5352007 |
Infestation |
|
Marisa Williams |
| 5392029 |
Infestation |
|
John M. Randall |
| 5392030 |
Infestation |
Bigger plant |
John M. Randall |
| 1350069 |
Infestation |
suitable for a biocontrol program |
University of Idaho Archive |
| 1459268 |
Infestation |
|
Steve Dewey |
| 1350045 |
Infestation |
in Northern Idaho |
University of Idaho Archive |
| 1459273 |
Infestation |
|
Steve Dewey |
| 2308109 |
Infestation |
|
John M. Randall |
| 1459271 |
Management |
Hand-pulled knapweed |
Steve Dewey |
| 1459272 |
Plant(s) |
|
Steve Dewey |
| 1459269 |
Plant(s) |
|
Steve Dewey |
| 1459270 |
Plant(s) |
|
Steve Dewey |
| 0886049 |
Plant(s) |
|
Jim Story |
| 1459267 |
Plant(s) |
Rosette |
Steve Dewey |
| 1539018 |
Plant(s) |
|
James H. Miller |
| 1539019 |
Plant(s) |
|
James H. Miller |
| 1350046 |
Plant(s) |
rosette |
Linda Wilson |
| 1350047 |
Plant(s) |
|
Cindy Roche |
| 1350068 |
Plant(s) |
|
University of Idaho Archive |
| 1196233 |
Plant(s) |
in flower |
Michael Shephard |
| 1196234 |
Plant(s) |
|
Michael Shephard |
| 1196225 |
Plant(s) |
|
Michael Rasy |
| 1196028 |
Plant(s) |
Herbarium specimen |
Michael Shephard |
| 5229080 |
Plant(s) |
|
Richard Old |
| 1561074 |
Plant(s) |
photo taken on 21 July 1993 |
Catherine Herms |
| 1557009 |
Plant(s) |
After most seeds have been dispersed. |
Ohio State Weed Lab Archive |
| 1557010 |
Plant(s) |
in flower |
John Cardina |
| 1557002 |
Plant(s) |
in flower |
Ohio State Weed Lab Archive |
| 1557004 |
Plant(s) |
|
Ohio State Weed Lab Archive |
| 1557005 |
Plant(s) |
|
Ohio State Weed Lab Archive |
| 5392032 |
Plant(s) |
Young plant |
John M. Randall |
| 5379604 |
Plant(s) |
in flower in June |
James H. Miller |
| 5392028 |
Plant(s) |
Big plant |
John M. Randall |
| 5352006 |
Plant(s) |
in flower |
Marisa Williams |
| 5271010 |
Plant(s) |
|
Leslie J. Mehrhoff |
| 5358637 |
Plant(s) |
Spotted knapweed plant, Centaurea stoebe ssp. micranthos (Centaurea maculosa), in bloom. |
L.L. Berry |
| 5358638 |
Plant(s) |
Rosette of spotted knapweed, Centaurea stoebe ssp. micranthos (Centaurea maculosa), beginning to bolt. |
L.L. Berry |
| 5358639 |
Plant(s) |
Spotted knapweed plant, Centaurea stoebe ssp. micranthos (Centaurea maculosa), just beginning to bolt. |
L.L. Berry |
| 5360184 |
Plant(s) |
|
K. George Beck |
| 5374334 |
Plant(s) |
in flower |
Joseph M. DiTomaso |
| 5271008 |
Seed(s) |
seed head |
Leslie J. Mehrhoff |
| 5358641 |
Seedling(s) |
Seedling spotted knapweed plant, Centaurea stoebe ssp. micranthos (Centaurea maculosa). |
L.L. Berry |
| 5374339 |
Seedling(s) |
|
Joseph M. DiTomaso |
| 1557006 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1557007 |
Seedling(s) |
|
John Cardina |
| 1557008 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1553215 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1557018 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1557019 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1557020 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1557021 |
Seedling(s) |
cotyledons |
Ohio State Weed Lab Archive |
| 1196011 |
Seedling(s) |
|
UAF Cooperative Extension Archive |
| 1553210 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 0021035 |
Stand |
Field 20 miles east of Missoula |
Norman E. Rees |
| 0021036 |
Stand |
Field 20 miles east of Missoula |
Norman E. Rees |
| 0021037 |
Stand |
Field 20 miles east of Missoula |
Norman E. Rees |
| 0021038 |
Stand |
Field 20 miles east of Missoula |
Norman E. Rees |
