Symphyotrichum foliaceum |
Symphyotrichum prenanthoides |
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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 |
crooked-stem American-aster, crookedstem aster |
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Habit | Perennials 10–60 cm, colonial; long-rhizomatous. | Perennials, 20–90(–120) cm, colonial; long-rhizomatous. | ||||||||||||
Stems | 1–5+, ascending to erect, glabrous or sparsely puberulent. |
1(–3+), ascending to erect (usually flexuous, sometimes ± straight, sometimes stout, older often dark purple), glabrous proximally, moderately hirsute distally. |
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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 scabrous, apices mucronate, abaxial faces glabrous, midveins hispid to glabrate, adaxial scabrous; basal withering by flowering, petiolate (petioles slender or slightly winged, bases reddish, dilated, sheathing, ciliate), blades obovate to oblanceolate, 15–70 × 10–20 mm, bases attenuate, margins crenate-serrate, apices acute to obtuse; proximalmost cauline withering by flowering, proximal mostly persistent, petiolate to subpetiolate (petioles ± widely winged, bases dilated, strongly auriculate-clasping), blades ovate to lance-ovate or elliptic-lanceolate to oblanceolate, 80–160(–200) × 15–55 mm, progressively reduced distally, bases attenuate, margins sharply serrate (teeth mucronulate), apices acuminate to subcaudate; distal subpetiolate or sessile (petioles broadly winged, auriculate-clasping), blades oblanceolate to lanceolate, sometimes panduriform, 7–90 × 2–25 mm, progressively reduced distally, more sharply so on branches, bases attenuate (petiolate) or ± cuneate to auriculate-clasping and slightly constricted above auricles (panduriform), margins serrate or entire. |
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Peduncles | sparsely hairy, bracts 0–3, lanceolate. |
(8–)10–40 mm, sparsely to densely hispid, bracts lanceolate to linear-lanceolate, 3–12 mm, somewhat grading into phyllaries. |
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Involucres | campanulate, 6–16(–20) mm. |
campanulate, 5–6 mm. |
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Ray florets | 15–60; corollas violet to purple, laminae 8–18(–20) × 1–2 mm. |
17–25(–30); corollas usually lavender to blue, rarely white, laminae 7.5–12(–15) × 1–2 mm. |
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Disc florets | 50–150; corollas yellow, 4–7 mm, lobes triangular, 0.4–1 mm. |
39–50(–65); corollas cream colored or light yellow becoming purple or brown, 3.5–5 mm, tubes ± equaling campanulate to funnelform throats (thinly puberulent), lobes triangular, 0.5–1 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, oblong-lanceolate or -oblanceolate, slightly constricted near middle (outer) to linear-lanceolate or linear (inner), ± unequal (flexible), bases indurate 1/5–1/2, margins ± narrowly hyaline, scarious, erose, sometimes ciliolate distally, green zones lanceolate to linear-lanceolate (inner), often distally foliaceous, sometimes outer ± entirely so, apices spreading to ± squarrose, acute to acuminate, mucronulate, abaxial faces sparsely hirsutulous to glabrate or glabrous, adaxial glabrous or sparsely hirsutulous. |
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Heads | borne singly or in paniculiform arrays, branches ascending, up to 25 cm. |
in broad, ± flat, corymbo-paniculiform arrays, branches often purplish, divaricate to ascending, slender. |
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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. |
dull purple or stramineous with purple streaks or purplish-tinged, cylindro-oblanceoloid to obovoid, ± compressed, 2–3(–3.5) mm, 4–6-nerved, faces sparsely to moderately strigillose; pappi sordid, 3.5–4.5 mm. |
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2n | = 32. |
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Symphyotrichum foliaceum |
Symphyotrichum prenanthoides |
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Phenology | Flowering Aug–Oct. | |||||||||||||
Habitat | Moist or swampy grounds, woods, thickets, meadows, seeps, stream banks, roadsides | |||||||||||||
Elevation | 100–1500 m (300–4900 ft) | |||||||||||||
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC
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CT; DC; DE; IA; IL; IN; KY; MA; MD; MI; MN; NC; NJ; NY; OH; PA; VA; WI; WV; ON
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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 prenanthoides is of conservation concern in Canada and in a number of states. (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. 527. | ||||||||||||
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Aster foliaceus | Aster prenanthoides | ||||||||||||
Name authority | (Lindley ex de Candolle) G. L. Nesom: Phytologia 77: 282. (1995) | (Muhlenberg ex Willdenow) G. L. Nesom: Phytologia 77: 290. (1995) | ||||||||||||
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