Symphyotrichum spathulatum |
Symphyotrichum laurentianum |
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western aster, western mountain aster |
aster du golfe du saint-laurent, Gulf Of St. Lawrence aster |
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Habit | Perennials, 20–80 cm, colonial; long-rhizomatous. | Annuals, 1–13+ cm. | ||||||||
Stems | 1–5+, ascending to erect, glabrous or sparsely puberulent. |
1, decumbent to erect (straight), glabrous. |
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Leaves | thin, margins entire, apices acute, faces glabrous or sparsely puberulent; basal persistent, petiolate, blades narrowly elliptic to obovate, 50–150 × 3–15 mm, attenuate, margins entire; proximal cauline sessile or subpetiolate, blades linear to narrowly elliptic, 50–150 × 2–15 mm, bases attenuate or cuneate; distal sessile, blades 30–60 × 2–10 mm, reduced distally, bases cuneate to rounded. |
± fleshy, margins entire, eciliate, apices obtuse, faces glabrous; basal deciduous at bolting, petiolate, blades oblanceolate 44–50 × 5–7 mm [cult.], bases attenuate; proximal cauline and some distal withering by flowering; cauline sessile, blades linear-lanceolate to spatulate, 15–55 × 1–4 mm, reduced distally, bases cuneate; distal sessile, blades linear-lanceolate to spatulate. |
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Peduncles | sparsely hairy, bracts 0–3+. |
glabrous, bracts linear. |
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Involucres | campanulate, 5–10 mm. |
campanulate, 5–8+mm. |
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Ray florets | 15–40; corollas violet, laminae 9–15 × 1–2 mm. |
0. |
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Pistillate florets | 14–47+ in 2–3+ series; laminae 0 (corolla tubes 2–2.4 mm, shorter than style branches). |
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Disc florets | 30-80(–100); corollas yellow, sometimes becoming reddish, 4.5–6 mm, lobes triangular, 0.5–1 mm. |
5–8+; corollas yellow, 3.1–3.9 mm, lobes deltate to triangular, 0.2–0.3 mm. |
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Phyllaries | in 3–5 series, narrowly oblong or linear (outer) to linear (inner), unequal, bases indurate, margins entire, green zones elliptic to lanceolate, apices usually acute, sometimes obtuse, faces glabrous or ± puberulent. |
in 3–4 series, lanceolate, subequal, bases scarious, margins eciliate, green zones foliaceous (outer), apices obtuse, faces glabrous. |
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Heads | in corymbiform to paniculiform arrays, branches usually few. |
(disciform) in ± densely paniculiform arrays. |
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Cypselae | brown, cylindric to obovoid, not compressed, 2.5–3.5 mm, ± 4-nerved, faces hairy; pappi whitish, 5–7 mm. |
purple, obovoid, ± compressed, 2.8–2.9 mm, 2–4-nerved, faces strigillose; pappi white to yellowish white, 4.8–5.2 mm. |
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2n | = 14. |
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Symphyotrichum spathulatum |
Symphyotrichum laurentianum |
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Phenology | Flowering Aug–Sep. | |||||||||
Habitat | Brackish sand and mud, intertidal salt marshes, moist dune slacks | |||||||||
Elevation | 0 m (0 ft) | |||||||||
Distribution |
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT; nw Mexico
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NB; PE; QC |
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Discussion | Varieties 3 (3 in the flora). Symphyotrichum spathulatum is a variable species, widespread in montane regions of western North America. It hybridizes with S. bracteolatum, S. foliaceum, and S. hendersonii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Symphyotrichum laurentianum is known only from the southern shores of the Gulf of St. Lawrence. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 534. | FNA vol. 20, p. 500. | ||||||||
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Conyzopsis | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Aster spathulatus | Aster laurentianus, Aster laurentianus var. contiguus, Aster laurentianus var. magdalenensis | ||||||||
Name authority | (Lindley) G. L. Nesom: Phytologia 77: 291. (1995) | (Fernald) G. L. Nesom: Phytologia 77: 286. (1995) | ||||||||
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