Western Goldenrod, Western Goldentop: Euthamia occidentalis (Synonyms: Euthamia californica, Euthamia linearifolia, Solidago occidentalis) - Leaves and stems glabrous throughout. Leaves covered with small pits or translucent areas. Inflorescence leafy bracteate, the flower heads axillary but clustered at the tips of the branches. Lower leaves not ciliate margined toward the base. Rays mostly 15-30 per flower head. Plants of the lowlands and foothills.
Narrow Goldenrod, West Coast Goldenrod: Solidago elongata (Synonyms: Solidago canadensis ssp. elongata, Solidago canadensis var. elongata, Solidago canadensis var. salebrosa, Solidago lepida) -
Giant Goldenrod, Smooth Goldenrod, Late Goldenrod: Solidago gigantea (Synonyms: Aster latissimifolius var. serotinus, Solidago gigantea ssp. serotina, Solidago gigantea var. leiophylla, Solidago gigantea var. pitcheri, Solidago gigantea var. serotina, Solidago gigantea var. shinnersii, Solidago x leiophallax, Solidago pitcheri, Solidago serotina, Solidago serotinoides) - Stems 40-200 cm high. Stems glabrous below the inflorescence, bluish in color. Lower leaves not ciliate margined toward the base. Rays mostly 10-17 per flower head. Plants of the lowlands and foothills.
Alaskan Goldenrod, Canada Goldenrod, Western Canada Goldenrod: Solidago lepida var. lepida (Synonyms: Solidago canadensis var. lepida, Solidago canadensis var. subserrata, Solidago lepida, Solidago lepida var. molina) -
Canada Goldenrod, Meadow Goldenrod, Rocky Mountains Canada Goldenrod, Rocky Mountain Goldenrod, Rough Canada Goldenrod: Solidago lepida var. salebrosa (Synonym: Solidago canadensis ssp. elongata, Solidago canadensis ssp. salebrosa, Solidago canadensis var. salebrosa , Solidago dumetorum, Solidago elongata, Solidago lepida var. elongata, Solidago lepida var. fallax) - Plants 4-200 cm high. Stems covered with minute hairs below the inflorescence. Plants not bluish. Leaves glabrous to canescent. Lower leaves not ciliate margined toward the base. Rays mostly less than 10-17 per flower head. Plants of the lowlands and foothills.
Missouri Goldenrod: Solidago missouriensis (Synonyms: Solidago missouriensis var. extraria, Solidago missouriensis var. fasciculata, Solidago missouriensis var. missouriensis, Solidago misouriensis var. tolmieana) - Stems glabrous below the inflorescence. Plants not bluish. Lower leaves not ciliate margined toward the base. Rays mostly 5-11 per flower head. Plants of the lowlands and foothills.
Manyray Goldenrod, Northern Goldenrod, Rocky Mountain Goldenrod: Solidago multiradiata (Synonyms: Solidago ciliosa, Solidago multiradiata ssp. scopulorum, Solidago multiradiata var. scopulorum, Solidago scopulorum) - Plants to 50 cm high. Lower leaves evidently ciliate margined toward the base. Rays mostly about 13 per flower head. Plants of higher altitudes in the mountains.
Alpine Goldenrod, Dune Goldenrod, Dwarf Goldenrod: Solidago simplex var. nana (Synonyms: Solidago decumbens, Solidago simplex ssp. simplex var. nana, Solidago spathulata var. nana) -
Coast Goldenrod, Dune Goldenrod: Solidago simplex var. spathulata (Synonyms: Solidago spathulata, Solidago spathulata ssp. spathulata, Solidago spathulata var. spathulata) -
Basin Goldenrod, Showy Goldenrod: Solidago spectabilis - Plants 30-150 cm high. Plants mostly glabrous throughout. Rays mostly 8, or 10-13. Branches of the inflorescence much shorter than those of S. candadensis, S. gigantea, and S. missouriensis.
California Goldenrod, Threenerve Goldenrod, Velvety Goldenrod: Solidago velutina (Synonyms: Solidago arizonica, Solidago californica, Solidago californica var. nevadensis, Solidago canadensis var. arizonica, Solidago howellii, Solidago sparsiflora, Solidago spathulata var. subcinerea, Solidago trinervata, Solidago velutina ssp. californica, Solidago velutina ssp. sparsiflora, Solidago velutina var. nevadensis) -