Solidago elongata |
Solidago riddellii |
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Cascade Canada goldenrod, narrow goldenrod, west coast Canada goldenrod, west coast goldenrod, west coast or Cascade Canada goldenrod |
Riddell's goldenrod |
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Habit | Plants 25–150 cm; rhizomes short to long creeping, forming few- to many-stemmed clones. | Plants 40–100 cm; caudices branching; vascular bundles and petiole bases marcescent (attached to old stems for more than a season). |
Stems | 1–20+, erect, proximally sparsely to moderately strigoso-villous, distally usually moderately to densely so. |
1–10+, erect, glabrous. |
Leaves | basal 0; proximal cauline sessile, blades narrowly to broadly oblanceolate, 35–75(–100) × (6–)7.5–14(–20) mm, proximal much smaller, tapering to bases, margins subentire or finely serrulate to coarsely, sharply serrate (teeth 0–9 per side), ciliate, 3-nerved, sometimes obscurely so, apices acute, abaxial faces glabrate to sparsely short-strigose, adaxial glabrous; mid to distal cauline sessile, blades oblanceolate, becoming lanceolate distally, 20–60 × 4–8(–11) mm, largest near mid stem, somewhat to much reduced distally, margins entire or finely serrulate, rarely serrate (teeth 1–8 per side), usually becoming entire to sparsely serrulate distally, ciliate, apices acute, faces glabrous or sparsely strigoso-villous, more so along abaxial nerves. |
basal and proximal cauline usually withering by flowering (other rosettes may be present), tapering to long, winged petioles, blades often recurved, linear- lanceolate or -oblanceolate, 100–240 × 8–16 mm, folded along midrib (V-shaped in cross section), bases usually with (2–)3–8 prominent lateral nerves, apices acute to obtuse, faces glabrous; mid to distal cauline sessile, blades recurved, linear-lanceolate, 50–70 × 8–11 mm, reduced distally, folded, bases with prominent lateral nerves. |
Peduncles | 2–7 mm, sparsely to moderately short strigoso-villous; bracteoles 1–3, linear, rarely minutely stipitate-glandular. |
2.8–4 mm, moderately short-hispido-strigose, lanceolate bracteoles 0–1. |
Involucres | narrowly campanulate, 2.5–3.5(–4) mm. |
narrowly campanulate, 4.5–6 mm. |
Ray florets | (8–)11–15(–17); laminae 1–2.5 × 0.1–0.4(–0.7) mm. |
7–9; laminae 4.5–5.5 × 0.4–0.5 mm. |
Disc florets | (3–)5–11(–16); corollas 2.6–3.7(–4) mm, lobes 0.5–1.2 mm. |
6–10; corollas 4.5–5.2 mm, lobes 0.7–1.8 mm. |
Phyllaries | in 3–4 series, strongly unequal, margins sparsely long ciliate, acute, faces glabrous, rarely sparsely minutely stipitate-glandular; outer lanceolate, inner linear-lanceolate. |
(14–18) in 3–4 series, unequal, obtuse, broad, striations weak, obtuse to rounded, glabrous. |
Heads | 12–500+, sometimes secund, in short to long, thyrsiform or narrowly secund-pyramidal paniculiform arrays, usually congested, club-shaped to rarely wand-shaped, (2.5–) 10–20 × (2–)4–8(–10) cm, branches usually ascending or sometimes arching spreading. |
30–450 in corymbiform to somewhat paniculiform with rounded corymbiform branches (robust plants) arrays, branches and peduncles strigillose. |
Cypselae | (narrowly obconic) 1–1.5 mm, sparsely to moderately strigose; pappi 2.5–3.3 mm. |
1.5–2.2 mm, glabrous; pappi 3.5–4 mm (apically clavate). |
2n | = 18, 36. |
= 18. |
Solidago elongata |
Solidago riddellii |
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Phenology | Flowering Aug–Oct. | Flowering Sep–Oct. |
Habitat | Sandy, gravelly soils, coastal headlands, thickets, open woods, meadows, along streams and creeks | Wet prairielike sites and marshy ground |
Elevation | 0–2800 m (0–9200 ft) | 100–400 m (300–1300 ft) |
Distribution |
CA; OR; WA; Mexico (Baja California)
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IL; IN; MI; MN; MO; OH; WI; MB; ON
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Discussion | In California, coastal plants of Solidago elongata often have thicker leaves; those of the Sierras are often membranous and obscurely triple-nerved. This species can be similar to S. lepida, which usually has much larger distal cauline leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 20, p. 154. | FNA vol. 20, p. 165. |
Parent taxa | Asteraceae > tribe Astereae > Solidago > sect. Solidago > subsect. Triplinerviae | Asteraceae > tribe Astereae > Solidago > sect. Ptarmicoidei |
Sibling taxa | ||
Synonyms | S. canadensis subsp. elongata, S. caurina, S. elongata var. microcephala, S. lepida var. caurina, S. lepida var. elongata | Aster riddellii, Oligoneuron riddellii, S. amplexicaulis |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 327. (1841) | Frank: W. J. Med. Phys. Sci. 8: 499. (1835) |
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