Weedy, dry to mesic prairies but much more often in disturbed, usually open, grassy places: roadsides, railroads, fallow fields, fencerows, crop fields, orchards, gardens, access lanes, and vacant lots, sometimes floodplain forests and banks of rivers, streams, and lakes.

Most of our plants represent var. subglabrata (Mack. & Bush) Cronquist, having thin, ovate to elliptic-ovate leaf blades abruptly narrowed to a long petiole and relatively long, flowering pedicels and corollas. Several of our records represent the more western var. longifolia, having relatively thick, lanceolate to narrowly elliptic or narrowly rhombic leaf blades tapering into often shorter petioles and somewhat shorter, flowering pedicels and corollas. Variation among our specimens is complex, making infraspecific determination difficult.