Photographs: Inchigeelagh, Co. Cork

Narrow-fruited Water-cress Nasturtium microphyllum (Rorippa microphylla) Biolar mion Family: Brassicaceae Flowering time: May-October. Perennial. Native. The white flowers with 4 petals on erect flowering stems are followed by slender fruit containing a single row of seeds. Leaves are pinnate, the leaflets usually un-lobed. Leaves and the slightly fleshy stems turn purple-brown in autumn. A hairless creeping plant, rooting at the stem nodes Frequent in and beside shallow streams, ponds and marshes in similar locations to Water-cress, Nasturtium officinale and hybrids can occur.

Narrow-fruited Water-cress, Nasturtium microphyllum, Biolar mion