Thlaspi arvense, known by the common name field pennycress, is a flowering plant in the cabbage family Brassicaceae. Thlaspi arvense is a foetid, hairless annual plant, growing up to 60 cm (24 in) tall, with upright branches. The stem leaves are arrow-shaped, narrow and toothed. It blooms between May and July, with racemes or spikes of small white flowers that have 4 sepals and 4 longer petals.