Appearance
It is a variable species and many forms have been described, but they are generally no longer recognised. Two varieties are accepted, however. The flowers emerge in August through October to show dark blue to rarely white ray florets and yellow to cream-coloured disc florets that become pink or purple with maturity.
Distribution
It is one of the widest ranging plants of the genus, being present from the edges of the Great Plains to the Atlantic coast and from the Gulf coast of Texas north to southern Ungava Bay in the north of Quebec.References:
Some text fragments are auto parsed from Wikipedia.
