Thlaspi arvense
Brassicaceae
Field Pennycress
Erect stems with numerous branches or unbranched. Few basal leaves with short petioles, narrowly oval, shedding before bloom time; stem leaves clasping, toothed or wavy-edged. Flowers small and white atop stems. Seedpods ascending, round to widely oval, less than 3/4 in. across, flat, with papery edges and notched tip. Grows in disturbed soils along roads, fields, at low to mid-elevations.
- Rarity: Common
- Flowering Time: Early Summer, Mid Summer, Late Summer
- Flower Form: Petals 4
- Life Cycle: Annual
- Height: 6–24 inches
- Habitat: Disturbed, Meadow
- Found In: Mt. Rainier NP, Olympic NP, Siskiyous, Steens, Wallowas
- Native: No
