5B. Leaves triple nerved, not scabrous; leaves of lower and upper
stem tend to be similar; stem glabrous and glaucous below the inflorescence
and not angled; tends to be clonal...............Solidago
gigantea
(NOTE: Solidago gigantea may hybridize with Solidago
altissima. Such hybrids are often sparsely pubescent on the
stem below the inflorescence and may be cited in some works as
Solidago canadensis.)