2b. var. dakotica A. Nelson

Pl. 419 b, c

Corolla lobes broadly triangular, 1–3 mm long. 2n=26. August–October.

Scattered nearly throughout the state (North Dakota to Nebraska east to Illinois and Missouri; Canada). Upland prairies, glades, and openings of mesic upland forests.

This is by far the most common variety in Missouri.