Sinapis Arvensis, Charlock Mustard

Stems of sinapis arvensis are covered by bristly hairs of differing lengths, which differentiates this species from similar plants in the brassica genus. Other identifying characteristics include the unlobed upper stem leaves and the spreading sepals

Common name:
Charlock mustard
Scientific name:
Sinapis arvensis
Main flower color:
Central and south England, and lower elevation regions (often coastal) of Wales, Scotland and northern England
Up to 60 cm
Fields, grassland, waste ground
Up to 20 mm in diameter; four clawed yellow petals and four linear green sepals, spreading almost to 90 degrees
Hairy green pods up to 4 cm long, with a two-valved lower segment, covered by short bristly hairs, and a smooth, shorter upper segment
Basal leaves are stalked, ovate to lyre-shaped, lined by wavy, toothed lobes, while upper stem leaves are sessile, generally unlobed, and irregularly toothed. All leaves have small, bristly hairs along the edges
April to October