Solidago lepida |
Solidago nana |
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Canada goldenrod, Rocky Mountain goldenrod, verge d'or élégante, western Canada goldenrod, western goldenrod |
baby goldenrod, dwarf goldenrod |
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Habit | Plants 25–150 cm; rhizomes short to long creeping, forming few- to many-stemmed clones. | Plants 10-50 cm; rhizomes stout or caudices branching. | ||||||||
Stems | 1–25 (–50+), erect, proximally glabrous or sparsely to moderately canescent-villous, distally densely so. |
1–6, decumbent to ascending, finely and densely puberulent. |
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Leaves | basal 0; proximal cauline sessile, blades narrowly to broadly oblanceolate, 100–150 × 15–23 mm, tapering to bases, margins subentire to coarsely sharply serrate, 3-nerved, sometimes obscurely so, apices acute to acuminate, abaxial faces glabrate to sparsely short villous, adaxial glabrous; mid to distal cauline sessile, blades lanceolate to narrowly elliptic, (50–)90–120(–150) × (7–) 11–23(–35) mm, largest near mid stem, then somewhat reduced distally in arrays, margins sharply and coarsely to finely serrate or entire, usually becoming less serrate near arrays, faces glabrous or sparsely strigoso-villous, more so along abaxial nerves, distalmost (below arrays) sometimes sparsely to moderately minutely stipitate-glandular. |
basal present at flowering; basal and proximal petiolate, blades oblanceolate to narrowly obovate or spatulate, 20–100 × 5–20 mm, basal much smaller than proximal, margins serrate or entire, somewhat 3-nerved, apices obtuse to acute, cuspidate, faces moderately to densely finely puberulent; mid and distal cauline sessile, blades oblanceolate to elliptic to base, 1 prominent nerve, 10–30 × 4–12 mm, greatly reduced distally, attenuate, margins entire or distally serrate, apices acute, faces densely finely puberulent. |
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Peduncles | 1–4 mm, villoso-hirtellous, sometimes minutely stipitate-glandular; bracteoles 0–2, linear-lanceolate, sometimes minutely stipitate-glandular. |
2–7 mm, moderately puberulent; bracteoles 0–2, elliptic, minute. |
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Involucres | campanulate, (2–)2.3–3.8(–5) mm. |
campanulate, 4–6 mm. |
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Ray florets | (7–)10–16(–22); laminae (0.5–)0.9–1.6(–2.2) × ca. 0.2–0.5 mm. |
(5–)6–10 (fewer than number of disc florets); laminae ca. 3 × 1.3–1.6 mm. |
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Disc florets | (2–)5–9(–13); corollas ca. (2–) 2.5–3.8(–5) mm, lobes (0.4–)0.6–1(–1.4) mm. |
8–20; corollas 4–4.5 mm, lobes 0.8–1.1 mm. |
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Phyllaries | in 3–4 series, deltate-lanceolate, unequal (outer 1/4–1/2 length of inner), margins sparsely villoso-ciliate, sometimes minutely stipitate-glandular apically or basally, apices acute to attenuate, glabrous or sparsely to moderately, minutely stipitate-glandular apically, sometimes over much of faces. |
in 3–4 series, oblong, strongly unequal, margins ciliate, apices blunt, glabrous. |
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Heads | 14–800+, in sometimes secund, broadly thyrsiform or secund pyramidal arrays, usually leafy proximally, branches ascending or sometimes arching-spreading, leaves often minutely stipitate-glandular. |
30–100, in broadly corymbiform (modified paniculiform) arrays, sometimes somewhat secund. |
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Cypselae | (narrowly obconic) 0.6–1.2 mm, strigillose; pappi 2.5–3.3 mm. |
(narrowly obconic) 2–2.8 mm, sparsely strigose; pappi 3.5–4 mm. |
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2n | = 18. |
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Solidago lepida |
Solidago nana |
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Phenology | Flowering Aug–Sep. | |||||||||
Habitat | Dry to wet soils, often alkaline meadows and flats, open wooded slopes | |||||||||
Elevation | 1700–2700 m (5600–8900 ft) | |||||||||
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; UT; WA; WY; AB; BC; MB; NB; NF; NT; ON; QC; SK; YT
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AZ; CO; ID; MT; NM; NV; UT
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Discussion | Subspecies 2 (2 in the flora). Solidago lepida is the only member of subsect. Triplinerviae that is nearly always minutely, sometimes sparsely, stipitate-glandular in the arrays. These glands can be very small and visible only with 30–70× magnification. The enlarged head of the stalked gland may be little bigger than a pollen grain. The species occurs in the west from the Aleutian Islands and central Alaska south just into northern California, and in the Rocky Mountains to Arizona and New Mexico. Its range extends across Canada to Newfoundland, the Gaspé (Quebec), and northern New Brunswick. It also appears to be introduced at scattered locations across the Canadian prairies. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 155. | FNA vol. 20, p. 161. | ||||||||
Parent taxa | Asteraceae > tribe Astereae > Solidago > sect. Solidago > subsect. Triplinerviae | Asteraceae > tribe Astereae > Solidago > sect. Solidago > subsect. Nemorales | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Aster lepidus, S. canadensis var. lepida | Aster nanus, S. nivea | ||||||||
Name authority | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 339. (1836) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 327. (1841) | ||||||||
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