Conringia orientalis

Conringia orientalis is a species of flowering plant in the mustard family known by the common name hare's ear mustard. It is native to Eurasia but it is known elsewhere as an introduced species and sometimes a noxious weed. It is weedy in its native range and also in North America, where it is a widespread invasive species, especially in central Canada.
It is an annual herb producing an unbranched erect stem in height. The thick, waxy leaves are generally oval in shape, up to long, and clasp the stem at their bases. The flower is enclosed in pointed sepals and has yellow, clawed petals about long. The fruit is a beaded silique up to long. The plant is known to be toxic to livestock.