Scientific name: Brassica nigra (L.) W.D.J. Koch
Common name: Black Mustard
Description
Habit: Annual, to 2 m high.
Stems: Erect, coarse.
Leaves: Alternate; lower leaves in a basal rosette, rough-hairy, pinnately lobed with the terminal lobe the largest; stem-leaves lobed below, unlobed above, with petioles, not clasping the stem.
Flowers: Yellow, actinomorphic, hermaphrodite, 9-13 mm across, in racemes; sepals 4, free; petals 4, free; stamens 6 and ovary superior.
Fruits: A silique, cylindrical, with short and slender beak; erect, pressed against the stem.
Habitat: Disturbed ground.
Distribution: Rare.
Native status: Native
Of conservation interest: No