Symphyotrichum anomalum |
Symphyotrichum robynsianum |
|
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manyray aster |
aster à longues feuilles, longleaf aster, Robyns' aster |
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Habit | Perennials, 20–100(–120) cm, cespitose; usually with short, stout, branched caudices, woody with age, sometimes long-rhizomatous. | Perennials, 10–80 cm, colonial; long-rhizomatous. |
Stems | 1–5+, erect or ascending (straight, often stout), proximally usually ± densely hirtellous, sometimes glabrescent, distally hirsute. |
1, erect (± flexuous, often reddish), glabrous, hairy in lines distally. |
Leaves | thick, firm, margins (slightly undulate) scabrous, adaxial faces glabrous or strigose, scabrous, adaxial ± sparsely hirsute to scabro-hirtellous, sometimes ± scabrous (cauline sometimes with tufts of smaller leaves in axils); basal withering by flowering, petiolate (petioles sometimes narrowly winged), blades oblong-ovate to lanceolate, 10–40 × 10–20 mm, bases deeply cordate, margins sparsely serrate to serrulate, apices usually acute, sometimes obtuse to rounded; proximal cauline usually withering by flowering, petiolate (petioles slender to ± winged), blades ovate to broadly lanceolate, 40–90 × (15–) 25–50 mm, bases shallowly cordate or rounded to attenuate, rarely truncate, margins subentire or entire (rarely serrulate), apices acute or acuminate, with short callus point; distal subpetiolate or sessile, blades ovate to lanceolate or linear-lanceolate, 10–70 × 1–10 mm, gradually or abruptly reduced distally, bases attenuate to cuneate, margins entire, apices acute to acuminate. |
stiff, margins sparsely serrulate or entire, ± revolute, scabrous, apices acute to acuminate, mucronulate, faces glabrous, sometimes midveins hairy; basal withering by flowering, long-petiolate, petioles narrowly winged, bases sheathing, blades lanceolate, ca. 20 × 3–5 mm, slightly attenuate to narrowly cuneate; proximal cauline withering by flowering, sessile or subpetiolate, blades linear-lanceolate to -oblanceolate, 100–200 × 4–8 mm, bases cuneate to attenuate, clasping; distal sessile, blades linear-lanceolate to linear, 10–110 × 1–7 mm, progressively reduced distally, bases cuneate to rounded, slightly clasping or not, margins entire. |
Peduncles | densely bracteate, 0.3–5(–10) cm (rarely subsesssile), bracts numerous, linear, 2–6 mm, mucronulate, grading into phyllaries. |
glabrous or ± densely pilose in lines, bracts 1–4, linear, sometimes inrolled distally, clasping, ciliate, distal 1–2 often subtending and surpassing involucres. |
Involucres | campanulate, 5–10 mm. |
campanulate, 5–8.5 mm. |
Ray florets | 18–45; corollas usually bright lavender-blue to purple, seldom white, laminae 9–15(–18) × 1–3.2 mm. |
20–35; corollas dark blue-violet, seldom white, laminae 8–13 × 1–1.5 mm. |
Disc florets | 33–40+; corollas cream or light yellow turning pinkish purple, (4–)4.5–5.5 mm, tubes shorter than funnelform throats, lobes sometimes ± spreading, triangular to lanceolate, 0.5–0.8 mm. |
(18–)23–40; corollas yellow, 4–6.5 mm, tubes shorter than funnelform throats, lobes lanceolate, 0.8–1 mm. |
Phyllaries | in 4–6 series, oblong-lanceolate (outer) to oblanceolate-linear (innermost), unequal, bases indurate (appressed), margins ciliate to scabro-ciliate, green zones diamond-shaped to lanceolate, ± foliaceous distally, apices reflexed to squarrose, long-acuminate, apiculate, often purple, faces strigoso-hirtellous. |
in 3–4 series, oblong-lanceolate, subequal, bases indurate 1/3–3/4, margins scarious, erose, hyaline, ciliate proximally, sparsely ciliolate distally, green zones lanceolate to linear, sometimes outer ± foliaceous, apices acuminate to long-acuminate, often foliaceous, mucronate to apiculate, faces glabrous, eglandular. |
Heads | in open, diffuse, paniculiform arrays, branches divaricate, stout, long, densely bracteate. |
in elongate, open, narrow, paniculiform or racemiform arrays, branches ascending, short, leafy, branch leaves smaller and reduced distally (heads 1–3 per branch). |
Cypselae | deep purple to purplish brown or brown with purple speckles (nerves stramineous), oblong-obovoid, compressed, (1–)2.5–3.5(–3.8) mm, 5–6-nerved, faces glabrous; pappi tawny or rose-tinged, 3.7–5.2 mm. |
tan, obovoid, compressed, ca. 2.2–2.4 mm, 5–6-nerved, faces sparsely strigillose; pappi pinkish, 7–8 mm. |
2n | = 16. |
= 64, 80. |
Symphyotrichum anomalum |
Symphyotrichum robynsianum |
|
Phenology | Flowering late Aug–Oct. | Flowering Aug–Sep. |
Habitat | Dry, sandy, loamy, or clayey soils over limestone, or acid soils over chert, sandstone, or granite, rocky, open deciduous woods, thickets, dry ridges, cliffs, bluffs, occasional along streams | Wet or damp, open, sandy, gravelly, or rocky grounds, often calcareous, cracks in rocky stream or lake shores, limestone alvars, seasonally wet glades and swales, jackpine outwash plains |
Elevation | 50–500 m (200–1600 ft) | 10–400 m (0–1300 ft) |
Distribution |
AR; IL; KS; MO; OK
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MI; MN; WI; MB; ON; QC
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Discussion | A. G. Jones (1989, 1992) reported that Symphyotrichum anomalum may hybridize with S. drummondii, S. oolentangiense, and S. shortii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The name Aster longifolius Lamarck has been misapplied to this taxon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 504. | FNA vol. 20, p. 530. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum |
Sibling taxa | ||
Synonyms | Aster anomalus | Aster robynsianus |
Name authority | (Engelmann ex Torrey & A. Gray) G. L. Nesom: Phytologia 77: 275. (1995) | (J. Rousseau) Brouillet & Labrecque: Phytologia 82: 138. (1997) |
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