Color, bright yellow. Petals, 5 to 8, much larger than the 5 sepals, with a small scale at the base. Leaves, immersed in water or floating on the top, cut into thread-like divisions. The upper leaves are less divided than the lower, and the leaflets are variously shaped, toothed and lobed.

A perennial by means of runners which root at their joints. The achenes are compressed into a roundish head, each one tipped with a straight, pointed beak. Often several feet long. An aquatic found in still or slow-moving waters from Maine to North Carolina and westward. A variety terrestris, grows in mud, with leaves firmer, not so much dissected, and with smaller flowers.