Photographs: Foynes port, Co. Limerick

Field Penny-cress Thlaspi arvense Praiseach fhia Family: Brassicaceae Flowering May-October. Annual. Introduced. Small white flowers with 4 petals are followed by round, flat fruit with a deeply notched wing. The leaves are oblong, slightly lobed or toothed and the upper leaves are stalkless and clasp the stem. A hairless plant with a strong, foetid smell when crushed. Height 25-60cm. A fairly widespread casual on disturbed ground, roadsides, waste ground, landfill sites and near ports but less frequent in western Ireland

Field Penny-cress, Thlaspi arvense, Praiseach fhia