Solidago riddellii |
Solidago lepida |
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Riddell's goldenrod |
Canada goldenrod, Rocky Mountain goldenrod, verge d'or élégante, western Canada goldenrod, western goldenrod |
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Habit | Plants 40–100 cm; caudices branching; vascular bundles and petiole bases marcescent (attached to old stems for more than a season). | Plants 25–150 cm; rhizomes short to long creeping, forming few- to many-stemmed clones. | ||||||||
Stems | 1–10+, erect, glabrous. |
1–25 (–50+), erect, proximally glabrous or sparsely to moderately canescent-villous, distally densely so. |
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Leaves | 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. |
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. |
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Peduncles | 2.8–4 mm, moderately short-hispido-strigose, lanceolate bracteoles 0–1. |
1–4 mm, villoso-hirtellous, sometimes minutely stipitate-glandular; bracteoles 0–2, linear-lanceolate, sometimes minutely stipitate-glandular. |
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Involucres | narrowly campanulate, 4.5–6 mm. |
campanulate, (2–)2.3–3.8(–5) mm. |
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Ray florets | 7–9; laminae 4.5–5.5 × 0.4–0.5 mm. |
(7–)10–16(–22); laminae (0.5–)0.9–1.6(–2.2) × ca. 0.2–0.5 mm. |
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Disc florets | 6–10; corollas 4.5–5.2 mm, lobes 0.7–1.8 mm. |
(2–)5–9(–13); corollas ca. (2–) 2.5–3.8(–5) mm, lobes (0.4–)0.6–1(–1.4) mm. |
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Phyllaries | (14–18) in 3–4 series, unequal, obtuse, broad, striations weak, obtuse to rounded, glabrous. |
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. |
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Heads | 30–450 in corymbiform to somewhat paniculiform with rounded corymbiform branches (robust plants) arrays, branches and peduncles strigillose. |
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. |
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Cypselae | 1.5–2.2 mm, glabrous; pappi 3.5–4 mm (apically clavate). |
(narrowly obconic) 0.6–1.2 mm, strigillose; pappi 2.5–3.3 mm. |
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2n | = 18. |
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Solidago riddellii |
Solidago lepida |
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Phenology | Flowering Sep–Oct. | |||||||||
Habitat | Wet prairielike sites and marshy ground | |||||||||
Elevation | 100–400 m (300–1300 ft) | |||||||||
Distribution |
IL; IN; MI; MN; MO; OH; WI; MB; ON
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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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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. 165. | FNA vol. 20, p. 155. | ||||||||
Parent taxa | Asteraceae > tribe Astereae > Solidago > sect. Ptarmicoidei | Asteraceae > tribe Astereae > Solidago > sect. Solidago > subsect. Triplinerviae | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Aster riddellii, Oligoneuron riddellii, S. amplexicaulis | Aster lepidus, S. canadensis var. lepida | ||||||||
Name authority | Frank: W. J. Med. Phys. Sci. 8: 499. (1835) | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 339. (1836) | ||||||||
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