Apium L. >

Leaves not filiform, 1 mm or more wide Apium
Stems prostrate or ascending or rarely erect. Leaves once or twice pinnatisect, often rather thick; the segments tripartite. Compound rays 3–6, each with an umbel of rather numerous small white flowers. Fruit c. 3 mm long; mericarps with 5 thick ribs. Small perennial with a thick rootstock. Sea Celery
Leaflets divided, primary segments 2–3 times as long as broad. Widespread. Coastal dunes and headlands. Fl. spring–autumn Apium prostratumfiliforme