Mapping is provisional. This widespread southern species, ranging into tropical regions, is close to the more eastern pentagona and can also be confused with gronovii. C. campestris may be predominant in states south of Ky. (e.g. Ch). Although combined with pentagona in some recent treatments, Costea et al. (2006a; in prep. for FNA) confirmed its distinction. It has larger flowers, more broadly triangular corolla lobes, and less imbricate calyx lobes (F, W; Spaulding 2013b); see also Y, with comparison to gronovii. Like pentagona, it occurs on a wide range of herbaceous hosts, and is often abundant in cultivated fields on uplands.