Sisymbrium altissimum

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Scientific Name Sisymbrium altissimum USDA PLANTS Symbol SIAL2
Common Name Tumble Mustard, Jim Hill Mustard ITIS Taxonomic Serial No. 23312
Family Brassicaceae (Mustard) SEINet
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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 with edges rolled inward (cuculate).
Bloom Period: May to October.
References: "Flora of Colorado" by Jennifer Ackerfield, Montana Plant Life and SEINet.
BONAP Distribution Map

Colorado Status:

© Tom Lebsack 2021