| Image |
Descriptor |
Description |
Photographer |
| 1459264 |
Feature(s) |
Bud stage with detached bracts |
Steve Dewey |
| 5358636 |
Feature(s) |
Close-up view of the stem and leaves of Russian knapweed (Acroptilon repens), showing characteristic fuzz (hairs, "knap"). |
L.L. Berry |
| 5360182 |
Feature(s) |
Seven foot deep root pit |
K. George Beck |
| 5374234 |
Flower(s) |
|
Joseph M. DiTomaso |
| 5391795 |
Flower(s) |
A young flower |
John M. Randall |
| 1459265 |
Flower(s) |
|
Steve Dewey |
| 5224099 |
Flower(s) |
|
Richard Old |
| 5224100 |
Flower(s) |
|
Richard Old |
| 0022036 |
Flower(s) |
|
Eric Coombs |
| 1459261 |
Flower(s) |
|
Steve Dewey |
| 5391801 |
Flower(s) |
|
John M. Randall |
| 5391803 |
Flower(s) |
Nice flower |
John M. Randall |
| 5225001 |
Foliage |
|
Richard Old |
| 5391797 |
Foliage |
Conniving foliage |
John M. Randall |
| 5374237 |
Foliage |
basal rosette |
Joseph M. DiTomaso |
| 5376283 |
Fruit(s) |
base of achene |
Julia Scher |
| 5376284 |
Fruit(s) |
|
Julia Scher |
| 5376285 |
Fruit(s) |
|
Julia Scher |
| 5391796 |
Fruit(s) |
A seedhead |
John M. Randall |
| 5306049 |
Fruit(s) |
|
Steve Hurst |
| 0022039 |
Infestation |
|
Norman E. Rees |
| 0022041 |
Infestation |
|
Norman E. Rees |
| 5391798 |
Infestation |
Harrassing a tree |
John M. Randall |
| 5391799 |
Infestation |
Excluding all else |
John M. Randall |
| 5391800 |
Infestation |
Nasty infestation |
John M. Randall |
| 1459260 |
Infestation |
|
Steve Dewey |
| 5391802 |
Infestation |
|
John M. Randall |
| 5391804 |
Plant(s) |
Dessicating |
John M. Randall |
| 5374233 |
Plant(s) |
in flower |
Joseph M. DiTomaso |
| 5374235 |
Plant(s) |
|
Joseph M. DiTomaso |
| 5374236 |
Plant(s) |
fruiting |
Joseph M. DiTomaso |
| 1459258 |
Plant(s) |
|
Steve Dewey |
| 1459262 |
Plant(s) |
|
Steve Dewey |
| 1459263 |
Plant(s) |
|
Steve Dewey |
| 0022037 |
Plant(s) |
|
Norman E. Rees |
| 0022038 |
Plant(s) |
|
Norman E. Rees |
| 5358634 |
Research |
Dr. George Beck, Colorado State University, measuring the root penetration of a Russian knapweed plant (Acroptilon repens). |
L.L. Berry |
| 5360181 |
Root(s) |
Crown root section of Russian knapweed |
K. George Beck |
| 5364437 |
Seed(s) |
Seeds of Russian knapweed (Acroptilon repens). |
Howard F. Schwartz |
| 5376286 |
Seed(s) |
cross section |
Julia Scher |
| 5358635 |
Seedling(s) |
Seedling Russian knapweed plant (Acroptilon repens). |
L.L. Berry |
| 1459259 |
Seedling(s) |
|
Steve Dewey |
| 5225002 |
Stem(s) |
|
Richard Old |
| 5360183 |
Twig(s)/Shoot(s) |
Russian knapweed buds in April |
K. George Beck |
