VVP, VRiv, GipP, CVU, HSF, Strz.
Three varieties are recognised, two in Australia (Semple & Uesugi 2017), but the differences are slight. Victorian occurrences are referred to Solidago altissima var. altissima. See profile under that name.
Semple, J.C.; Uesugi, A. (2017). Solidago altissima var. pluricephala (Asteraceae: Astereae) in Australia, Tonga and Hawaii.. Phytoneuron 40: 1–16.