Scientific name: Sinapis alba L.
Common name: White Mustard
Description
Habit: Annual with sparse, stiff hairs, to 1 m high.
Stems: Erect, one- to many-branched, slightly hispid.
Leaves: Upper leaves stalked, usually deeply pinnately lobed.
Flowers: Yellow, 12-14 mm across, actinomorphic, in racemes; sepals 4, free; petals 4, free; ovary superior.
Fruits: A silique, 2-4 cm long; spreading; covered with stiff, spreading, white hair; ending in a flattened beak with 0-1 seeds.
Habitat: Cultivated ground, roadsides.
Distribution: Rather rare.
Native status: Not native; naturalised
Of conservation interest: No