|
Oklahoma State
University | |
|
Oklahoma Alfalfa |
|
|
|
|
Oklahoma State
University | |
|
Oklahoma Alfalfa |
|
|
| Canada Thistle | |
| COMMON NAME: | Canada Thistle, Field Thistle |
| SCIENTIFIC NAME: | Cirsium discolor |
| TYPE: | Perennial Cool-season Broadleaf |
| DESCRIPTION | |
| Germination: | Late Spring and Summer (June to August). |
| Reproduction: | Rhizomes and seeds. |
| Stems: | Erect, branching above, and pubescent below with hollow forming colonies. |
| Flowers: | Pink to purple and on rare occasions white, the male is the staminate corolla and the female is the pistillate. |
| Leaves: | The leaves of the Canada Thistle alternate and have simple blades. The leaves on the lower stem have blades that are oblong to oblanceolate with margins that are shallowly to pinnately lobed and the margins and lobes are short-spined. The upper stem leaves are similar except that they reduce upwards, are less lobed, and they are sessile. |
| Fruit: | One-seeded achene that is dark brown to tan. |
| Found: | Canada Thistle is found primarily on rangeland, pastures, cropland, ditch banks, roadsides, mud flats, stream and lake banks, disturbed sites, and especially in deep and moist soil. |
| Control: | |
| Jim Stritzke Former Alfalfa Weed Control Specialist Department of Plant and Soil Sciences Oklahoma State University |
|
