Similar in appearance to Oil-seed Rape but the yellow flowers of Brassica rapa overtop the buds. The upper leaves are grey and clasp the stem the basal leaves are greener and bristly. Plants exist as basal rosettes until flowering stems develop at maturity, usually in the second year. The lower leaves are large (up to 12 inches).

Brassica napus subsp oleifera, B. oleraceus (rape and cabbage)

Stem-leaves clasp stem at base, green and hairy/bristly; long seed pods, sticking out from stem, with beak; one row in reach valve (= 2 rows); each valve has one vein; flowers overtop buds slightly, forming concave 'bowl'.

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Arable land, waste places, streamsides usually as a non persistent casual.

Flowers May to August.

Annual or biennial.

Occasional - widespread over most of Britain.

Occasional in Leicestershire and Rutland, usually as a non persistent casual. In the 1979 Flora survey of Leicestershire it was found in 59 of the 617 tetrads.

In the current Checklist (Jeeves, 2011) it is listed as Alien, occasional