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giant goldenrod, smooth goldenrod

Habit Plants 5–20 dm; rhizomatous.
Stems

simple or branched, glabrous, glaucous.

Leaves

cauline;

blades broadly to narrowly oblanceolate or elliptic, 4–15 cm;

margins entire to denticulate or serrulate;

tips acute;

surfaces glabrous; nerves pilose, sessile or short-petioled.

Inflorescences

thyrse-like arrays, rarely club-shaped;

bracts reduced distally.

Involucres

campanulate, 2–5 mm.

Ray florets

7–20.

Disc florets

5–15;

corollas 2.5–4.5 mm.

Phyllaries

in 3–5 series, linear-lanceolate;

surfaces glabrous; outer gradually shorter.

Fruits

1.3–1.5 mm, slightly strigose.

Heads

pedunculate.

2n

=18, 36, 54.

Solidago riddellii

Solidago gigantea

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Meadows, riverbanks, wetlands, roadsides, disturbed areas. Flowering Jul–Sep. 0–1000 m. BW, Col, Owy, Sisk, WV. CA, ID, NV, WA; throughout North America. Native.

Source Flora of Oregon, volume 2, page 345
Kenton Chambers
Sibling taxa
S. elongata, S. gigantea, S. lepida, S. missouriensis, S. multiradiata, S. simplex, S. spathulata, S. spectabilis, S. velutina
S. elongata, S. lepida, S. missouriensis, S. multiradiata, S. simplex, S. spathulata, S. spectabilis, S. velutina
Synonyms Solidago gigantea var. serotina
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