Symphyotrichum ontarionis |
Symphyotrichum anomalum |
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aster du lac Ontario, bottomland aster, Ontario American-aster, Ontario aster |
manyray aster |
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Habit | Perennials, 20–120 cm, colonial; long-rhizomatous. | Perennials, 20–100(–120) cm, cespitose; usually with short, stout, branched caudices, woody with age, sometimes long-rhizomatous. | ||||
Stems | 1–(2–3), ascending to erect (straight), proximally glabrate, distally uniformly villous or hirsute, or glabrous (var. glabratum). |
1–5+, erect or ascending (straight, often stout), proximally usually ± densely hirtellous, sometimes glabrescent, distally hirsute. |
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Leaves | thin, margins scabrous, apices mucronate, abaxial faces usually sparsely to densely strigose or strigillose, sometimes glabrous (var. glabrum), adaxial usually strigose or scabrous, sometimes glabrate or glabrous (var. glabrum); basal withering by flowering, petiolate to subpetiolate (petioles narrowly winged, ciliate, bases sheathing), blades spatulate to oblanceolate-obovate, 10–40 × 5–10 mm, bases attenuate, margins crenate-serrate, apices acute to rounded; proximalmost cauline usually withering by flowering, petiolate or sessile (petioles narrowly winged, ± clasping), blades ovate or lance-ovate to elliptic-lanceolate or oblanceolate, 20–80(–12) × 5–35 mm, progressively reduced distally, bases attenuate to cuneate, margins serrate (sometimes coarsely) to crenate-serrate, apices acute to acuminate or short-caudate; distal sessile, blades elliptic-lanceolate to oblanceolate or lanceolate, (6–)10–80+ × 2–25 mm, progressively reduced distally, bases cuneate, margins entire to serrulate, apices acute to acuminate. |
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. |
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Peduncles | subsessile or 2–10(–20) mm, ± pilose, bracts 1–5, linear-lanceolate, pilose, grading into phyllaries. |
densely bracteate, 0.3–5(–10) cm (rarely subsesssile), bracts numerous, linear, 2–6 mm, mucronulate, grading into phyllaries. |
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Involucres | campanulate, 3–5.5 mm. |
campanulate, 5–10 mm. |
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Ray florets | (10–)15–26; corollas usually white, rarely pinkish or light purple to blue, laminae 3.5–5.5(–8) × 0.5–1.5 mm. |
18–45; corollas usually bright lavender-blue to purple, seldom white, laminae 9–15(–18) × 1–3.2 mm. |
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Disc florets | 12–25; corollas cream or light yellow turning magenta or purple (ampliate), 2.5–4(–4.5) mm, tubes shorter than funnelform throats, lobes slightly spreading to reflexed, lanceolate, 0.7–1.1 mm. |
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. |
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Phyllaries | in (3–)4–6 series, unequal, appressed or ± spreading, linear-obovate (outer) to oblong-lanceolate to linear (inner), bases indurate 1/3–3/4, margins narrowly scarious to apices, erose, hyaline, ciliate, green zones lanceolate, apices acute to acuminate, mucronulate, faces (outer) sparsely pilose or glabrous (var. glabratum), (inner) glabrous. |
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. |
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Heads | in ample, open, paniculiform arrays, branches ± ascending or divaricate to long-arching, ± secund. |
in open, diffuse, paniculiform arrays, branches divaricate, stout, long, densely bracteate. |
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Cypselae | gray or tan, oblong-obovoid, sometimes ± compressed, 1.2–1.8(–2) mm, 3–5-nerved, faces strigillose; pappi whitish to white, 3–3.5 mm. |
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. |
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2n | = 16. |
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Symphyotrichum ontarionis |
Symphyotrichum anomalum |
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Phenology | Flowering late Aug–Oct. | |||||
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 | |||||
Elevation | 50–500 m (200–1600 ft) | |||||
Distribution |
AL; IA; IL; IN; KS; KY; LA; MI; MN; MO; MS; NC; NE; NY; OK; PA; SD; TN; TX; VT; WI; ON; QC
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AR; IL; KS; MO; OK
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Discussion | Varieties 2 (2 in the flora). Symphyotrichum ontarionis is often confused with S. lateriflorum, from which it can be distinguished by its shorter disc corolla lobes and abaxial leaf faces either moderately to densely hairy or glabrous to glabrate (var. glabratum), and without hairs along midveins (as is typical of S. lateriflorum). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
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Key |
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Source | FNA vol. 20, p. 518. | FNA vol. 20, p. 504. | ||||
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Aster ontarionis, Aster missouriensis | Aster anomalus | ||||
Name authority | (Wiegand) G. L. Nesom: Phytologia 77: 287. (1995) | (Engelmann ex Torrey & A. Gray) G. L. Nesom: Phytologia 77: 275. (1995) | ||||
Web links |