Photographs: Ardmore, Co. Waterford

White Mustard Sinapis alba Sceallagach Family: Brassicaceae Flowering May-August. Annual. Introduced. The pale yellow flowers are followed by fruit with stiff white hairs and a flattened beak as long as the pod. All leaves are stalked and the lower leaves are deeply pinnate-lobed. Height to over 1m Most frequent in south and south-east Ireland on waste ground, roadsides, field edges and coastal shingle. Still grown as a crop and also for green manure. Prefers calcareous soils. Identified by Paul Green, BSBI Similar: Charlock, Sinapis arvensis

White Mustard, Sinapis alba, Sceallagach