|Scientific Name||Thlaspi arvense||USDA PLANTS Symbol||THAR5|
|Common Name||Field Pennycress||ITIS Taxonomic Serial No.||23422|
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
© Tom Lebsack 2023
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County