Photographs: Castletownsend, Co. Cork

Upright Yellow-sorrel Oxalis stricta Seamsóg ghallda Family: Oxalidaceae Flowering May-October. Annual or short-lived perennial. Introduced Umbels of 2-5 yellow flowers followed by seeds without white patches. Self-pollinating and seeds freely. Flower stalks are erect when fruiting. The tri-foliate leaves have heart-shaped leaflets, sometimes purple-tinged. Stems not rooting at nodes but has slender underground stolons. An introduced garden weed and occasional garden escape that is usually casual but can be persistent. Most frequent in Northern Ireland.

Upright Yellow-sorrel, Oxalis stricta, Seamsóg ghallda