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Rhexia
See list of 2 species in this genus-
1a. Stem with 1 opposing pair of angles larger, darker, and convex, the other pair of angles smaller, paler, and flat to concave; petals dull light purple to white, usually glabrous; apical, tubular portion of the hypanthium as tall as or taller than the basal, globose portion
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1b. Stem with all 4 angles subequal; petals red-purple, usually bristly on the abaxial surface; apical, tubular portion of the hypanthium shorter than the basal, globose portion
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Each photo represents one species in this genus.