Apium graveolens can be recognised by its hairless leaves, triangular, coarsely-toothed leaflets, flowers both terminal and at the leaf nodes, and by the strong smell of celery.
Main flower color:
Coastal regions of Ireland, Wales and Scotland; most common in the south
Up to 80 cm
Ditches, rough grassland; usually saline locations
Small, white, five-petalled, in clusters up to 6 cm across, both at the tip of the stem branches, attached by long stalks, and at the upper leaf nodes, where they are stalkless. Rays in the umbels have differing lengths. Umbels lack both bracts and bracteoles
Hairless, shiny; basal leaves are up to 20 cm long, pinnately divided into large-toothed, triangular segments. Stem leaves are trifoliate, with narrower leaflets
June to August