This common weed found in fields and along disturbed areas is Common Tansymustard, also called flixweed and herb sophia (Descurainia sophia), a member of the Mustard Family (Brassicaceae).
The yellow flowers have four petals and four sepals. A long narrow, fruit called a silique will form. The entire plant can grow to be up to 3 feet tall, and is found across most of the U.S., despite being native to Europe.
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