Wild mustard, charlock

Sinapis arvensis

Upright annual, seed-propagated weed with a short taproot, originates from Eurasia.
Characteristic yellow flowers.
Cotyledons: Vigorous, inverse-cordate, petiolate, strongly sinuate at the tip.
Stems: Erect, with ramified branches especially at the top, roughly haired below, up to 60 cm (23.62 inch) high.
Leaves: Lower leaves petiolate, lobed, or sinuate-dentate, nearly lyre-formed.
Upper leaves ovate-oblong, only short-petiolate to sessile, irregularly dentate, usually undivided.
The first true leaf has a broad, rounded tip and shallow indentations along its margins.

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