3. Sabatia campestris Nutt. (prairie rose-gentian)

Pl. 421 g, h; Map 1878

Stems 15–35(–40) cm long, square in cross-section, often slightly winged, the branches mostly alternate. Leaves ovate to lanceolate-ovate, with rounded to cordate, clasping bases, widest near the base, 8–25(–30) mm long. Calyces deeply lobed, strongly 5-ribbed or winged, (11–)14–30 mm long, the lobes linear to lanceolate, (6–)10–22 mm long. Corollas pink to white, with a greenish yellow spot at the base of each lobe, the lobes broadly obovate to spathulate, 10–21 mm long, 2.0–2.5 times as long as the tube. 2n=26. July–September.

Scattered in the Unglaciated Plains Division, uncommon elsewhere, mostly in counties along the Missouri River and the eastern portion of the Ozarks (Kansas to Texas east to Illinois and Mississippi; introduced in New England). Glades, upland prairies, sand prairies, mesic upland forests, and banks of streams and rivers; also pastures, ditches, railroads, roadsides, and open, disturbed areas.