Montana Field Guide

Plants aquatic. Stems floating with glabrous to sparsely hairy foliage. Leaf blades 10–30 mm long, reniform, twice divided into numerous thread-like segments. Flowers solitary at leaf nodes; petals white, 4–9 mm long, twice as long as the glabrous, deciduous sepals. Achenes glabrous or sparsely hairy, cross-corrugate, 1–2 mm long with a straight beak ca. 0.5 mm long; heads hemispheric, 3–5 mm high (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Shallow water of ponds, lakes, streams at all elevations (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).