Thlaspi arvense L. Brassicaceae (Mustard family)
Erect winter or summer annual.
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.
Field pennycress rosette (left) and upper leaf (right).
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, .5 inch-wide pods with a prominent notch at the tip.
Field pennycress flowering cluster (left) fruit (right).
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