Symphyotrichum foliaceum |
Symphyotrichum porteri |
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alpine leafybract aster, Canby's leafybract aster, Cusick's American aster, Cusick's aster, Henderson's aster, Kootenai aster, leafy aster, leafy or leafy-bract or alpine leafybract aster, leafy-bract aster, Parry's aster |
Porter's or smooth white aster, smooth white aster |
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Habit | Perennials 10–60 cm, colonial; long-rhizomatous. | Perennials, 10–50 cm, cespitose; usually with branched caudices, sometimes long-rhizomatous. | ||||||||||||
Stems | 1–5+, ascending to erect, glabrous or sparsely puberulent. |
1–4+, ascending to erect (straight), glabrous. |
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Leaves | thin, margins entire or sometimes serrate, apices acute to obtuse, faces usually glabrous, sometimes sparsely hairy; basal usually persistent, petiolate to subpetiolate, blades broadly elliptic to obovate, 30–200 × 8–25(–30) mm, bases attenuate, margins entire or sometimes serrate, apices acute to obtuse; proximal cauline sessile or subpetiolate, blades elliptic to obovate, 35–120 × 8–25 mm, bases attenuate or cuneate to rounded, sometimes ± clasping, apices acute; distal sessile, reduced distally, bases cuneate, apices acute. |
thin, margins usually entire, sometimes very sparsely serrulate distally, scabrous, apices acute, mucronulate, faces glabrous; basal usually deciduous at flowering (new winter rosettes developed by flowering), petiolate (petioles narrow or ± winged, then appearing sessile, slightly sheathing, ciliate), blades oblanceolate to obovate or spatulate, 5–45+ × 2–6 mm, cuneate, apices obtuse; proximal cauline usually withering by flowering, petiolate or sessile (petioles winged, slightly clasping, ciliate), blades oblanceolate or lanceolate to linear-oblanceolate or -lanceolate, 40–80(–90) × 2–5(–6) mm, bases cuneate; distal sessile, blades linear-lanceolate to linear, ± falcate, 8–60 × 0.5–3 mm, reduced distally, bases cuneate to rounded-cuneate. |
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Peduncles | sparsely hairy, bracts 0–3, lanceolate. |
0.2–2.8 cm, bracteate, glabrous, bracts 1–3, linear to linear-lanceolate. |
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Involucres | campanulate, 6–16(–20) mm. |
campanulate to cylindro-campanulate, 3.6–5(–6) mm. |
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Ray florets | 15–60; corollas violet to purple, laminae 8–18(–20) × 1–2 mm. |
(12–)20–34(–42); corollas usually white, seldom pinkish, laminae 6.8–12 × 0.7–1.8 mm. |
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Disc florets | 50–150; corollas yellow, 4–7 mm, lobes triangular, 0.4–1 mm. |
(30–)40–75(–103); corollas pale yellow becoming pink and later brown, (2.8–)3.1–3.9(–4.9) mm, tubes much shorter than narrowly funnelform throats, lobes triangular, (0.3–)0.5–0.7(–0.8) mm. |
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Phyllaries | in 4–6 series, oblanceolate or oblong (outer) to lanceolate or linear (inner), subequal or unequal (outer exceeding inner), bases outer foliaceous, inner indurate, margins entire, green zones elliptic to lanceolate, apices acute to rounded, faces glabrous or puberulent. |
in 4–6 series, linear-lanceolate to -oblanceolate (outer) or oblong-lanceolate (inner), unequal, bases indurate 1/4–3/4 (sometimes outermost foliaceous), margins proximally narrowly scarious, erose, hyaline, distally ciliolate, green zones lanceolate, apices acute, ± spreading, involute, mucronulate, faces glabrous. |
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Heads | borne singly or in paniculiform arrays, branches ascending, up to 25 cm. |
in paniculiform arrays, branches ascending, ± densely leafy with narrow branch leaves. |
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Cypselae | brown, cylindric to obovoid, not compressed, 2.5–4 mm, 3–4-nerved, faces hairy; pappi white to tawny, 5–8 mm. |
purple to stramineous, obovoid to oblanceoloid, compressed, 1–2 mm, 4–5-nerved, faces sparsely, finely strigillose; pappi white, 1.2–3.5 mm. |
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2n | = 16. |
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Symphyotrichum foliaceum |
Symphyotrichum porteri |
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Phenology | Flowering late Jul–Sep. | |||||||||||||
Habitat | Lower montane | |||||||||||||
Elevation | 1800–2900 m (5900–9500 ft) | |||||||||||||
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC
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CO; NM; WY
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Discussion | Varieties 4 (4 in the flora). Symphyotrichum foliaceum is extremely variable and is widespread in western montane coniferous forests and subalpine meadows. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Symphyotrichum porteri is the only western member of subsect. Porteriana; it grows in the foothills of the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 532. | FNA vol. 20, p. 513. | ||||||||||||
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | ||||||||||||
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Subordinate taxa | ||||||||||||||
Synonyms | Aster foliaceus | Aster porteri, Aster ericoides var. strictus | ||||||||||||
Name authority | (Lindley ex de Candolle) G. L. Nesom: Phytologia 77: 282. (1995) | (A. Gray) G. L. Nesom: Phytologia 77: 289. (1995) | ||||||||||||
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