| Xanthium strumarium L. |
| ASTERACEAE |
| burweed, clotbur, cocklebur, sheepbur, ditchbur, heartleaf cocklebur, common cocklebur, rough cocklebur, buttonbur, ditchbur, sea burdock, hedgehog burweed, sheepbur |
|
|
Invasive, Problem species |
| Origin: Uncertain, probably Central and South America |
| Growth Form: Herb |
| Plant Description: Plant: Much-branched annual up to 1.2 m high; stems stout, green, brownish or reddish-brown, often red-spotted, roughly-hairy.
Leaves: Green, paler below, shortly and harshly hairy on both surfaces; broadly three-lobed, up to 180 mm long x 180 mm wide, on long petioles.
Flowers: Green, inconspicuous, in the leaf axils, October–April.
Fruit: Burs up to 20 mm long, green turning yellowish then brown, in stalked axillary clusters, each bur crowned with two stout, curved or straight horns and covered with hooked spines. |
| Key Features: |
| Control: |
| Comments: |
More information:
Weeds & Invasive Plants Home Page
NRCS Plants Database
|
Photo - fruit/leaves
Larry Allain @ USDA-NRCS PLANTS Database
Photo - fruit
Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species. Midwest National Technical Center, Lincoln, NE.
|
|
|
|
| KEY |
 Confirmed (herbarium specimen) |
 Visual record |
 Suspected |
| Click on map grid square to view record information for each grid square. |
|
