Field pennycress, also known as stinkweed, fanweed and Frenchweed, is a member of the mustard family. This short-lived winter annual weed is found in cultivated fields, pastures, and waste places across North America. The plant grows up to 3 feet tall, with branches that spread out from the base. Its leaves are oblong with toothed edges, and its small white flowers bloom from March to June. Field pennycress is often considered a nuisance weed due to its ability to spread quickly and compete with crops for nutrients. Its numerous synonyms reflect its wide distribution and negative impact on agricultural productivity.