Apium prostratum

Prostrate biennial or perennial, branches slender (under 5 mm diam.), 30–70 cm long. Leaves 1–3-pinnate, lower leaves 5–20 cm long, those opposite inflorescence 2–15 cm long; primary leaflets 3–7(–9), sometimes 1–2-ternate; petiole as long or longer than lamina. Umbels 3.5–7 cm diam., sessile or rarely with peduncle to 20 mm long; rays 2–15, 0.5–5.5 cm long; umbellules 4–15-flowered; pedicels to 5 mm long. Petals ovate, white with yellow-brown midrib. Fruit obovate to orbicular, c. 1.5–2.5 mm long, the furrows between ribs almost concealed. Flowers Dec.–Mar.