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Weed Identification in Nurseries and Landscapes

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Field pennycress - Thlaspi arvense L.
Weed Identification in Nurseries and Landscapes > Field pennycress
Field pennycress rosette
Field pennycress rosette.

Life cycle: Erect winter or summer annual.

Leaves: Leaves initially develop from a basal rosette. Lower leaves are oval to spatula-shaped with wavy to slightly toothed margins, rounded tips and distinct petioles. Upper leaves are alternate with toothed to smooth margins and clasping bases. Basal leaves fall off before maturity.

Stems: Erect, mostly 2-foot-tall stems with varied branching bolt from a basal rosette to flower.

Flowers and fruit: White flowers with four small petals are found in terminal clusters. Fruit are flat, round to oval, distinctly winged, 1/2-inch-wide pods with a prominent notch at the tip.

Reproduction: Seeds.
Field pennycress flowers Field pennycress leaf Field pennycress fruit
Field pennycress flowering cluster. Field pennycress flowering cluster. Field pennycress fruit.
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated: 10/17/07