Ranunculus amphitrichus

Variable, partially or completely submerged stoloniferous perennial. Leaves usually arising singly at nodes; petioles 1–15 cm long; lamina c. circular in outline, 1–5 cm diam., glabrous, deeply 3–5-lobed with entire or notched, ovate to cuneate segments (emergent form) varying to palmatisect with linear segments 1–3 mm wide (submerged form). Flowering stems usually emergent usually 1–4-flowered; sepals 4 or 5, spreading, broadly ovate, 2–3 mm long, glabrous; petals 4–9, oblong to narrowly obovate, 3–5 mm long, 0.5–2 mm wide, pale yellow-green or yellow; nectary a crescentic swelling c. one-third from base of petal, lobe absent; stamens c. 10–18. Achenes usually 6–15, obliquely obovate, biconvex, 1.5–2 mm long (excluding beak), smooth or slightly wrinkled or warted on sides when mature; beak slender, straight or slightly curved, 1–1.5 mm long; receptacle pitted, glabrous or with few hairs in the staminal zone. Flowers Oct.–Dec.