Another of the many early Mustards (Brassicaceae).  These appear in very early May.  Even the seeds (which are the easiest way to identify this plant) are early.  That picture taken May 9.Field Pennycress (Thlaspi arvense L. Brassicaceae)

Field Pennycress (Thlaspi arvense L. Brassicaceae)

Field Pennycress (Thlaspi arvense L. Brassicaceae)

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