White goldenrod, Silverrod
Solidago bicolor L. is widely distributed in eastern North America (Semple & Cook 2006). The species is disguished by having white-rayed heads arranged in a wand shaped inflorescence. It is very similar to S. hispida, which has been included in the species by some authors. The two species can occur together, but I have not seen hybrids between them. The species is only known at the diploid level 2n=18.
Semple (2016) documented a Solidago bicolor × S. brendiae hybrid using multivariate morphometric analysis of specimens of S. bicolor, S. brendiae and S. canadensis. The hybrid was first reported by Hinds (1984) as S. bicolor × S. canadensis; the subsect. Triplinerviae parent was actually S. brendiae.