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Charlock or Wild Mustard - Sinapis arvensis

Charlock or Wild Mustard grows to a height of up to 75cm (30in) with an erect, little branched stem. Dark green leaves are irregularly hairy and irregularly toothed. Flowers 15-20mm (0.6-0.8in) across of four petals have yellow-green sepals and corollas yolk-yellow maturing to seed pods, either somewhat hairy or not at all. Flowers from April to October. Widespread and common annual of arable land and waste ground growing as a field weed, Related to Sinapis alba, a variety cultivated for seeds.

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