Photographs: Foynes, Co. Limerick

Winter-cress Barbarea vulgaris Treabhach Family: Brassicaceae Flowering: May-August. Biennial/perennial. Native. Small yellow flowers in dense racemes are followed by ascending fruits, the slender style 2-3.5mm. The deep-green shiny leaves are pinnately-lobed with a longer, broader terminal segment. Upper stem leaves are entire, toothed, or lobed to less than halfway to midrib. A hairless plant with branched erect stems and a strong tap-root. Height 30-90cm. Frequent on damp ground. Roadsides, waste ground, paths, streamsides Similar: American Wintercress, Barbarea verna and Medium-flowered Wintercress, Barbarea intermedia

Winter-cress, Barbarea vulgaris, Treabhach