| Image |
Descriptor |
Description |
Photographer |
| 5307004 |
Diagram or Graphic |
Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 553. |
USDA PLANTS Database |
| 5307006 |
Diagram or Graphic |
USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. |
USDA PLANTS Database |
| 1358353 |
Feature(s) |
Stem and foliage |
Mary Ellen (Mel) Harte |
| 1551186 |
Feature(s) |
|
Ohio State Weed Lab Archive |
| 5385902 |
Field |
|
Jan Samanek |
| 5385905 |
Flower(s) |
|
Jan Samanek |
| 5385907 |
Flower(s) |
|
Jan Samanek |
| 5385908 |
Flower(s) |
|
Jan Samanek |
| 5374380 |
Flower(s) |
female flowers |
Joseph M. DiTomaso |
| 5374381 |
Flower(s) |
male flowers |
Joseph M. DiTomaso |
| 5385901 |
Flower(s) |
|
Jan Samanek |
| 5356266 |
Flower(s) |
|
Terry L Spivey |
| 5356268 |
Flower(s) |
|
Terry L Spivey |
| 5358632 |
Flower(s) |
Close-up view of buds and flower of Canada thistle (Cirsium arvense). |
L.L. Berry |
| 5360187 |
Flower(s) |
Canada thistle early bud
|
K. George Beck |
| 5270079 |
Flower(s) |
|
Leslie J. Mehrhoff |
| 5270075 |
Flower(s) |
Flowers-white morph |
Leslie J. Mehrhoff |
| 5270077 |
Flower(s) |
Close-up of flowers |
Leslie J. Mehrhoff |
| 5090085 |
Flower(s) |
|
Mary Ellen (Mel) Harte |
| 5090089 |
Flower(s) |
|
Mary Ellen (Mel) Harte |
| 5230083 |
Flower(s) |
Female flower heads |
Richard Old |
| 5230085 |
Flower(s) |
Male flower heads |
Richard Old |
| 5230086 |
Flower(s) |
Male flower heads |
Richard Old |
| 1560073 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1459761 |
Flower(s) |
Purple and (rare) white flowers in the same field |
Steve Dewey |
| 1459764 |
Flower(s) |
|
Steve Dewey |
| 1459915 |
Flower(s) |
|
Steve Dewey |
| 1553261 |
Flower(s) |
|
Theodore Webster |
| 1560036 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1560037 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1560038 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1560039 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1560040 |
Flower(s) |
|
Ohio State Weed Lab Archive |
| 1358359 |
Flower(s) |
|
Mary Ellen (Mel) Harte |
| 1358360 |
Flower(s) |
|
Mary Ellen (Mel) Harte |
| 1358357 |
Flower(s) |
|
Mary Ellen (Mel) Harte |
| 1459756 |
Flower(s) |
|
Steve Dewey |
| 1459758 |
Flower(s) |
|
Steve Dewey |
| 0024019 |
Flower(s) |
|
Norman E. Rees |
| 1196013 |
Flower(s) |
|
Michael Shephard |
| 1334019 |
Flower(s) |
South Dakota |
Chris Evans |
| 1334020 |
Flower(s) |
South Dakota |
Chris Evans |
| 1334022 |
Flower(s) |
In a forested setting. South Dakota |
Chris Evans |
| 1358349 |
Flower(s) |
|
Mary Ellen (Mel) Harte |
| 1358351 |
Flower(s) |
|
Mary Ellen (Mel) Harte |
| 5392049 |
Flower(s) |
Male inflorescence |
John M. Randall |
| 5392050 |
Flower(s) |
|
John M. Randall |
| 5392051 |
Flower(s) |
|
John M. Randall |
| 5392052 |
Flower(s) |
|
John M. Randall |
| 5392053 |
Flower(s) |
|
John M. Randall |
| 5392054 |
Flower(s) |
|
John M. Randall |
| 5385914 |
Flower(s) |
|
Jan Samanek |
| 5392046 |
Flower(s) |
|
John M. Randall |
| 5392047 |
Flower(s) |
Flowerheads |
John M. Randall |
| 5385911 |
Foliage |
|
Jan Samanek |
| 5385912 |
Foliage |
|
Jan Samanek |
| 5385913 |
Foliage |
|
Jan Samanek |
| 1358352 |
Foliage |
|
Mary Ellen (Mel) Harte |
| 1358361 |
Foliage |
|
Mary Ellen (Mel) Harte |
| 1358354 |
Foliage |
|
Mary Ellen (Mel) Harte |
| 1358355 |
Foliage |
|
Mary Ellen (Mel) Harte |
| 1553265 |
Foliage |
basal rosette |
Ohio State Weed Lab Archive |
| 1560045 |
Foliage |
|
Theodore Webster |
| 1560050 |
Foliage |
|
Ohio State Weed Lab Archive |
| 1553262 |
Foliage |
basal rosette |
Ohio State Weed Lab Archive |
| 1459755 |
Foliage |
|
Steve Dewey |
| 1551183 |
Foliage |
|
Ohio State Weed Lab Archive |
| 1560067 |
Foliage |
|
Ohio State Weed Lab Archive |
| 1560057 |
Foliage |
basal rosette |
Anthony D. White |
| 1560058 |
Foliage |
basal rosette |
Ohio State Weed Lab Archive |
| 1560063 |
Foliage |
basal rosette |
Ohio State Weed Lab Archive |
| 5090086 |
Foliage |
|
Mary Ellen (Mel) Harte |
| 5090088 |
Foliage |
|
Mary Ellen (Mel) Harte |
| 5358630 |
Foliage |
Close-up view of the spines and waxy cuticle of Canada thistle (Cirsium arvense) leaves. |
L.L. Berry |
| 5270081 |
Foliage |
|
Leslie J. Mehrhoff |
| 5376367 |
Fruit(s) |
|
Julia Scher |
| 5376368 |
Fruit(s) |
apex of an achene |
Julia Scher |
| 5376369 |
Fruit(s) |
base of achene |
Julia Scher |
| 5376370 |
Fruit(s) |
cross section of achene |
Julia Scher |
| 5230084 |
Fruit(s) |
Female flower heads |
Richard Old |
| 1553264 |
Fruit(s) |
|
Ken Chamberlain |
| 1560041 |
Fruit(s) |
|
Ohio State Weed Lab Archive |
| 1560042 |
Fruit(s) |
|
Ohio State Weed Lab Archive |
| 1560043 |
Fruit(s) |
|
Ohio State Weed Lab Archive |
| 5392045 |
Fruit(s) |
Seedheads |
John M. Randall |
| 1553263 |
Infestation |
fruiting |
Theodore Webster |
| 1553268 |
Infestation |
in flower |
Ohio State Weed Lab Archive |
| 1551182 |
Infestation |
|
Ohio State Weed Lab Archive |
| 1459762 |
Infestation |
|
Steve Dewey |
| 1459759 |
Infestation |
With white flowers |
Steve Dewey |
| 1459757 |
Infestation |
|
Steve Dewey |
| 1299209 |
Infestation |
|
Vince Belleci |
| 1459754 |
Infestation |
In a pasture |
Steve Dewey |
| 1196257 |
Infestation |
|
UAF Cooperative Extension Archive |
| 1196143 |
Infestation |
|
UAF Cooperative Extension Archive |
| 0024021 |
Infestation |
|
Norman E. Rees |
| 1196009 |
Infestation |
|
UAF Cooperative Extension Archive |
| 5270076 |
Infestation |
|
Leslie J. Mehrhoff |
| 5270080 |
Infestation |
|
Leslie J. Mehrhoff |
| 1929056 |
Infestation |
in canola (Rape seed) field near Consort, Alberta |
Alec McClay |
| 5374379 |
Infestation |
male plants on left and female on right |
Joseph M. DiTomaso |
| 5362876 |
Infestation |
Canada thistle plants (Cirsium arvense) infesting field corn. |
Phil Westra |
| 5358631 |
Plant(s) |
Mature Canada thistle plant, Cirsium arvense. |
L.L. Berry |
| 5330089 |
Plant(s) |
|
Todd Pfeiffer |
| 5358460 |
Plant(s) |
Rosettes of Canada thistle (Cirsium arvense). |
Howard F. Schwartz |
| 5358615 |
Plant(s) |
Canada thistle plants (Cirsium arvense) going to seed along a roadside. |
L.L. Berry |
| 5358628 |
Plant(s) |
A Canada thistle (Cirsium arvense) plant going to seed. |
L.L. Berry |
| 5358629 |
Plant(s) |
Canada thistle (Cirsium arvense) at the rosette stage. |
L.L. Berry |
| 5374382 |
Plant(s) |
young sprout from rhizome |
Joseph M. DiTomaso |
| 5385906 |
Plant(s) |
with mature seed |
Jan Samanek |
| 5385903 |
Plant(s) |
|
Jan Samanek |
| 5385904 |
Plant(s) |
with mature seed |
Jan Samanek |
| 1929057 |
Plant(s) |
|
Leslie Dietz |
| 5090084 |
Plant(s) |
|
Mary Ellen (Mel) Harte |
| 1560047 |
Plant(s) |
in flower |
Ohio State Weed Lab Archive |
| 1560048 |
Plant(s) |
in flower; view from above |
Ohio State Weed Lab Archive |
| 5270078 |
Plant(s) |
|
Leslie J. Mehrhoff |
| 5230087 |
Plant(s) |
|
Richard Old |
| 1196010 |
Plant(s) |
|
UAF Cooperative Extension Archive |
| 1196252 |
Plant(s) |
|
UAF Cooperative Extension Archive |
| 1196121 |
Plant(s) |
|
Jamie Nielsen |
| 1237095 |
Plant(s) |
|
Dan Tenaglia |
| 1265114 |
Plant(s) |
|
Peggy Greb |
| 1358350 |
Plant(s) |
|
Mary Ellen (Mel) Harte |
| 1358358 |
Plant(s) |
|
Mary Ellen (Mel) Harte |
| 1459760 |
Plant(s) |
|
Steve Dewey |
| 1358356 |
Plant(s) |
|
Mary Ellen (Mel) Harte |
| 1459222 |
Plant(s) |
Along railroad right-of-way |
Steve Dewey |
| 1459763 |
Plant(s) |
With white flowers |
Steve Dewey |
| 5392048 |
Plant(s) |
Plants |
John M. Randall |
| 5391602 |
Plant(s) |
Weird white foliage |
Barry Rice |
| 5398054 |
Plant(s) |
leaf |
Robert Vidéki |
| 5398055 |
Plant(s) |
leaf |
Robert Vidéki |
| 5398056 |
Plant(s) |
leaf |
Robert Vidéki |
| 5398554 |
Plant(s) |
leaf |
Robert Vidéki |
| 5398555 |
Plant(s) |
leaf |
Robert Vidéki |
| 0024020 |
Research |
research site |
Norman E. Rees |
| 1551187 |
Seed(s) |
|
Ken Chamberlain |
| 5307005 |
Seed(s) |
|
Steve Hurst |
| 5385909 |
Seed(s) |
|
Jan Samanek |
| 5385910 |
Seed(s) |
|
Jan Samanek |
| 5310003 |
Seed(s) |
|
Ken Chamberlain |
| 5360185 |
Seed(s) |
Seed heads (capitula) of Canada thistle |
K. George Beck |
| 5364422 |
Seed(s) |
Seeds of Canada thistle (Cirsium arvense). |
Howard F. Schwartz |
| 5362875 |
Seedling(s) |
Seedling (or young rosette) of Canada thistle, Cirsium arvense. |
Phil Westra |
| 1560065 |
Seedling(s) |
cotyledons |
Ohio State Weed Lab Archive |
| 1560066 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560059 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560060 |
Seedling(s) |
cotyledons |
Ken Chamberlain |
| 1560061 |
Seedling(s) |
|
Theodore Webster |
| 1560062 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560069 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560070 |
Seedling(s) |
cortyledons |
Brian Sugarman |
| 1560071 |
Seedling(s) |
cotyledons |
Ohio State Weed Lab Archive |
| 1560072 |
Seedling(s) |
cotyledons |
Ohio State Weed Lab Archive |
| 1551184 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1553269 |
Seedling(s) |
|
Ken Chamberlain |
| 1553270 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560035 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560044 |
Seedling(s) |
with cotyledons |
Ohio State Weed Lab Archive |
| 1560052 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560053 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560054 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560055 |
Seedling(s) |
with cotyledons |
Ohio State Weed Lab Archive |
| 1560056 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560046 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1553266 |
Seedling(s) |
|
Theodore Webster |
| 1553267 |
Seedling(s) |
|
Ohio State Weed Lab Archive |
| 1560064 |
Stem(s) |
|
Theodore Webster |
