(Field Pennycress)

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Thlaspi arvense, Lake Dillon, Summit Co. 5829

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Thlaspi arvense, Lake Dillon, Summit Co. 5742

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Thlaspi arvense, Lake Dillon, Summit Co. 5734

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Thlaspi arvense, Breckenridge, Summit Co. 6365

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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
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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

Colorado Status:
Introduced

© Tom Lebsack 2022

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