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
Infrequent on a large gravel bar exposed by receding river 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 ~5-10 inches above the present river level. Full sun. Ray flowers absent.
Associates include Leersia oryzoides, Eragrostis hypnoides, Cyperus diandrus, C. strigosus, C. squarrosus, C. bipartitus, C. esculentus, Eleocharis acicularis, E. intermedia, Persicaria hydropiper, P. maculosa, Aster ontarionis, Physostegia virginiana, Amaranthus tuberculatus, Bidens cernua, Mimulus ringens, Pilea pumila.