Sisymbrium loeselii
(Small Tumbleweed Mustard)
Sisymbrium loeselii, Along CR 66 west of Meeker, Rio Blanco Co. 1288
Sisymbrium loeselii, Along CR 66 west of Meeker, Rio Blanco Co. 1278
Sisymbrium loeselii, Along CR 66 west of Meeker, Rio Blanco Co. 1285
Sisymbrium loeselii, Along CR 66 west of Meeker, Rio Blanco Co. 1296
Sisymbrium loeselii, Along CR 66 west of Meeker, Rio Blanco Co. 1304
| Scientific Name | Sisymbrium loeselii | USDA PLANTS Symbol | SILO3 |
| Common Name | Small Tumbleweed Mustard, Tall Hedge Mustard | ITIS Taxonomic Serial No. | 23315 |
| Family | Brassicaceae (Mustard) | SEINet Reference |
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| Description |
Life zones and habitat: Plains and foothills (3800 to 8000 ft); fields and pastures, roadsides, along streams and disturbed areas.
Plant: Erect annual, stems are 20 to 48 inches tall and branched in the upper portions, often densely hairy lower and smooth above. Leaves: Lower leaves are alternate, overall 1 to 3 or more inches long, pinnately-lobed or runcinate on petioles 0.4 to 1.6 inches long; tips pointed; upper leaves are less lobed and smaller; usually hairy. Inflorescence: Dense, elongated racemes with mature flower stalks less than 0.8-inch long and spreading; yellow mustard-like flowers with 4 yellow petals, about 0.3 inches wide, 8 upright stamens with yellow anthers; 4 small spreading yellow sepals, linear to oblong, less than 0.2-inch long and with tips with a single protruding hair. Bloom Period: May to September. Fruit: Very narrow pod 0.8 to 1.4 inches long, pointing upward, curved or straight, with the brown stub of the style at the tip. References: "Flora of Colorado" by Jennifer Ackerfield, Minnesota Wildflowers and SEINet. |
BONAP Distribution Map Map Color Key |
Colorado Status: Introduced |
© Tom Lebsack 2024
Banner photo: Castilleja rhexifolia and a brewing storm over the San Juan Mountains