United States, Washington, Cowlitz, Mount St. Helens National Monument, north side WA Rt. 504; drainage (valley) of the North Fork of Toutle River. Elev. ca. 3200 ft. At southeast point of Coldwater Lake area, near milepost 43. West Cascade Range & Crest Ecoregion.
Volcanic ash, mud and small rocks near small stream. Within eruption blast zone. Water probably with high mineral, sulphur content.; Successional marsh along small stream, south facing, north side of road. Full sun.; Locally common semi-aquatic to amphibious pink-tinted herb, in large masses in seeps along stream.