Mummenhoffia alliacea

Mummenhoffia alliacea, formerly known as Thlaspi alliaceum and commonly called garlic pennycress or roadside pennycress, is an annual or biennial herb of the Brassicaceae growing 25-65 cm tall. It is native to central and southern Europe and Anatolia and has been introduced and naturalized in the United Kingdom and parts of the eastern United States, typically on roadsides, field margins, and other disturbed ground. The plant develops a basal rosette of pinnately lobed leaves and an erect, simple or branched stem bearing alternate, sessile, clasping cauline leaves with auriculate bases. When crushed the foliage emits a distinctly garlic-like odor, hence the specific epithet. The terminal raceme bears small white four-petaled flowers about 4-5 mm across, followed by flattened obcordate silicles with a narrow apical notch, each containing several small seeds.