Photos: Gerry Flannery, Bull Island
White flowers, petals with yellow base. Young achenes are hairy, young fruits without short bristles. Laminal leaves are absent, the thread-like capillary leaves
on the central section of stem are shorter than the adjacent internodes.
Found in still or slow-moving, shallow water in ditches, pools and lake edges, can be semi-terrestrial on wet mud. Occasional in central and SE Ireland.
Thread-leaved Water-crowfoot, Bull Island, Co. Dublin. All photos © Gerry Flannery.