United States, Minnesota, Morrison, Along the Mississippi River at McDougall Island, at the edge of McDougall Wildlife Management Area, two miles west-northwest of Royalton.
45.8391354865 -94.3448893507
5077054N 395561E; T39N R32W sec28
315 meters
1035 feet
Occasional on a large gravel bar exposed by receding water levels. Moist, coarse, sand and gravel with a cap of small rounded cobbles mostly 0.5-2 (0.25-4) inches in diameter; setting is ~3-5 inches above the present river level. Full sun.
Associates include Cyperus squarrosus, C. bipartitus, C. esculentus, C. strigosus, Eleocharis acicularis, E. elliptica, E. intermedia, Lipocarpha micrantha, Leersia oryzoides, Panicum philadelphicum, Eragrostis hypnoides, Agalinus tenuifolia, Lindernia dubia, Persicaria hydropiper, P. maculosa, Amaranthus tuberculatus.