This is a widespread variable pantropical annual; 2n = 96-128 (FNA 23). It was recently reported in Ky. by Mears (1999). It is known only from a roadside in WHIT (EKY; Mears & Libby 1995), from a flower garden in MEAD (P. Haragan for EKY), and from a nursery in CAMP (J. Thieret #59758 at KNK). It is probably not yet well established in the state. A related species from temperate regions of Eurasia can also be expected: C. fuscus L. Both are easily overlooked or confused with other species (FNA 23, Y)