(Field Pennycress)

_DSC1056%20copy

Thlaspi arvense, Lake Dillon, Summit Co. 5829

_DSC1056%20copy

Thlaspi arvense, Lake Dillon, Summit Co. 5742

_DSC1056%20copy

Thlaspi arvense, Lake Dillon, Summit Co. 5734

_DSC1056%20copy

Thlaspi arvense, Breckenridge, Summit Co. 6365

_DSC1056%20copy

Thlaspi arvense, Breckenridge, Summit Co. 6368

Scientific Name Thlaspi arvense USDA PLANTS Symbol THAR5
Common Name Field Pennycress ITIS Taxonomic Serial No. 23422
Family Brassicaceae (Mustard) SEINet
Reference
Click Here
Description Life zones and habitat: Plains to montane (3700 to 10500 ft.); open areas, meadows, disturbed areas, roadsides.
Plant: Erect, single or branched annual 7 to 30 inches tall; bright green, hairless with an unpleasant odor when bruised.
Leaves: Oblanceolate or ovate basal leaves, 3/4 to 2-3/8 inches long, sinuate-dentate to lyrate on short petioles, withering early; alternate middle and upper leaves, ovate to lanceolate or auriculate, sometimes coarsely toothed, 5/8 to 1-5/8 inches long, sessile or clasping.
Inflorescence: Very small white flowers initially in a small, flat cluster at the top of the stem, four sepals, four white petals, six stamens.
Bloom Period: May to August.
Fruit: Large numbers of flat, obovate or suborbicular seed pods 3/8 to 1-5/8 inches across, on slender, upward curving stalks; deeply notched at tip, bright green to yellowish.
References: "Flora of Colorado" by Jennifer Ackerfield and SEINet.
BONAP Distribution Map


Map Color Key
Colorado Status:
Introduced

© Tom Lebsack 2024

Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County