Field pennycress – Thlaspi arvense - Plant & Pest Diagnostics

The photo is a field pennycress plant with white flowers. It has spatula-shaped leaves with slightly toothed margins.

Field pennycress – Thlaspi arvense

Thlaspi arvense L.

Brassicaceae (Mustard family)

MI Status

Non-native

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. Fruits are flat, round to oval, distinctly winged, 1/2-inch-wide pods with a prominent notch at the tip.

Reproduction

Seeds.

The photo is a field pennycress plant growing as a rosette. The leaves are oval with wavy margins. — Field pennycress rosette

The photo is a close-up of field pennycress flowers. They are white with four small petals that are found in terminal clusters. — Field pennycress flowers

The photo is a close-up of fruit from field pennycress. Fruits are flat, round to oval, and distinctly winged with a prominent notch at the tip. — Field pennycress fruit

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Plant & Pest Diagnostics