Sisymbrium altissimum

Click on the images below to see larger versions.

Scientific Name Sisymbrium altissimum USDA PLANTS Symbol SIAL2
Common Name Tumble Mustard, Jim Hill Mustard ITIS Taxonomic Serial No. 23312
Family Brassicaceae (Mustard) SEINet
Reference
Click Here
Description Life zones and habitat: Semi-desert to foothills (3500 to 9000 ft); grasslands, fields, roadsides and disturbed areas.
Plant: Erect, freely-branched annual up to 5 feet tall.
Leaves: Alternate leaves oblong in outline and up to 6 inches long, pinnately-lobed with 4 to 6 segments along each side; basal leaves with shallow lobes; stem leaves much more deeply lobed into linear segments almost appearing to be compound.
Inflorescence: Open racemes of pale yellow to yellow flowers; 4 petals about 1/4-inch long; sepals about half as long.
Bloom Period: May to October.
References: "Flora of Colorado" by Jennifer Ackerfield, Montana Plant Life and SEINet.
BONAP Distribution Map

Colorado Status:
Introduced

© Tom Lebsack 2020