Common name:
Black mustard
Family:
Scientific name:
Brassica nigra
Main flower color:
Range:
Most common in Wales and south/central England
Height:
Up to 100 cm
Habitat:
Disturbed ground, coastal cliffs and grassland
Flowers:
Compact or slightly elongated clusters of hairless, four-petalled yellow flowers, which have spreading sepals when mature, and are up to 2 cm in diameter. Stems are smooth and hairless above, often tinged purple below
Fruit:
Narrow, up to 2 cm long with a short, narrower beak; held upright, close to the stem
Leaves:
Basal leaves are pinnately lobed, with shallowly toothed margins, often somewhat bristly; stem leaves are narrower, hairless, and undivided
Season:
May to August
Rarity:
★★★★★
