Symphyotrichum ciliolatum |
Symphyotrichum hallii |
|
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aster ciliolé, fringe blue aster, Lindley's American-aster, Lindley's aster, Lindley's or fringe blue aster |
Hall's aster |
|
Habit | Perennials, (10–)20–120 cm, colonial or cespitose; usually long-rhizomatous, sometimes with branched caudices. | Perennials, 30–60 cm, colonial; long-rhizomatous. |
Stems | 1–3+, erect (straight to ± flexuous), glabrate to sparsely hirsute or strigillose, especially distally. |
1–6, ascending to erect, glabrous or puberulent, especially distally. |
Leaves | thin, margins coarsely, sharply serrate to crenate-serrate or serrulate, ciliate to scabrous, apices acute or acuminate, mucronulate, abaxial faces glabrate to sparsely hirsute, midveins usually densely hirsute, sometimes glabrous, adaxial glabrous or glabrate to scabrellous; basal usually withering by flowering (sometimes persistent on small plants), long-petiolate (petioles slightly winged, sheathing, ciliate), blades ovate, (24–)40–120(–270) × 15–70 mm, bases usually shallowly cordate, sometimes rounded; proximal cauline often withering by flowering, winged-petiolate, blades ovate to oblanceolate or lanceolate, (24–)60–150 × (10–)20–60 mm, reduced distally, bases subcordate to cuneate; distal sessile or sometimes subsessile (petioles widely-winged), blades lance-ovate to linear-lanceolate or linear, 18–75 × (2–)5–25 mm, bases cuneate, sometimes ± clasping, margins serrulate or entire. |
thin, margins entire, apices acute, faces glabrous or scabridulous; basal withering by flowering, petiolate, blades narrowly oblanceolate to linear, 10–60 × 2–10 mm, attenuate, margins entire; proximalmost cauline sometimes withering by flowering, sessile, blades linear to narrowly oblanceolate, 30–80 × 2–8 mm, bases cuneate, apices acute; distal sessile, blades linear, 10–50 × 2–8 mm, bases ± cuneate, truncate. |
Peduncles | 0.2–1.5+ cm, unequal, reduced distally, ± hirsutulous, bracts 0–4, subulate or linear. |
sparsely to densely hairy, bracts 3–10, linear to narrowly elliptic, much smaller than distal leaves. |
Involucres | campanulate, (4–)5–6.5 mm. |
campanulate, 4–7 mm. |
Ray florets | (12–)14–20; corollas pale to deep blue or bluish purple, laminae (8.3–)10–15 × 1–2.3 mm. |
14–35; corollas usually white, sometimes pale violet, laminae 7–12 × 1–2 mm. |
Disc florets | 14–25(–29); corollas yellow becoming reddish purple, 4.3–6.4 mm, tubes shorter than funnelform throats, lobes narrowly triangular, 0.5–1.1 mm. |
20–35; corollas yellow, 4.5–6.5 mm, lobes triangular, 0.7–1 mm, glabrous. |
Phyllaries | in 4–5 series, narrowly oblong-lanceolate to oblong-oblanceolate or linear-oblanceolate (innermost), ± unequal, bases indurate 1/3–2/3, margins narrowly scarious, erose, hyaline or infrequently purplish, sparsely ciliolate, green zones lanceolate to linear-lanceolate or linear, apices acuminate to long-acuminate, faces glabrous. |
in 5–6 series, appressed, narrowly oblanceolate (outer) to linear (inner), unequal, bases (outer) herbaceous or scarious less than 1/2, margins entire, green zones ovate to linear (inner), apices obtuse, faces glabrous. |
Heads | [(6–)13–50(–100+)] in open, paniculiform arrays, branches ascending. |
in racemiforn to paniculiform arrays, branches usually less than 10(–20) cm. |
Cypselae | yellowish white, obovoid, compressed, 1–2 mm, 5–6-nerved, faces glabrate to sparsely strigillose; pappi white to pinkish, 3–6 mm. |
brown, cylindric to obovoid, not compressed, 2–2.5 mm, 2–5-nerved, faces hairy; pappi white, 5–7 mm. |
2n | = 48. |
= 16, 32, 48. |
Symphyotrichum ciliolatum |
Symphyotrichum hallii |
|
Phenology | Flowering late Jul–Oct. | Flowering Jul–Aug. |
Habitat | Rich, open, often ± calcareous, boreal deciduous forests (aspen or aspen-birch-fir-spruce), edges of woods, clearings, aspen or bur oak thickets, sometimes open pine forests, streambanks, trails, roadsides | Summer-dry grasslands and meadows |
Elevation | 0–2000+ m (0–6600+ ft) | 0–500 m (0–1600 ft) |
Distribution |
IL; MA; ME; MI; MN; MT; ND; NH; NY; SD; VT; WI; WY; AB; BC; MB; NB; NF; NS; NT; ON; QC; SK; YT
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OR; WA
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Discussion | Symphyotrichum ciliolatum sporadically hybridizes with S. laeve var. laeve or var. geyeri in their areas of overlap, notably across the Canadian prairies and in south-central Ontario (Manitoulin Island, Bruce Peninsula). It also hybridizes with S. novi-belgii var. novi-belgii in the Gulf of St. Lawrence area [Symphyotrichum ×subgeminatum (Fernald) G. L. Nesom; syn. Aster subgeminatus (Fernald) B. Boivin]. Aster ciliolatus forma comatus Fernald is densely ciliolate along the midnerves and represents an extreme of the variation found in the species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Symphyotrichum hallii is restricted to open habitats of the Puget Trough of western Washington and the Willamette Valley of western Oregon, with outlying stations in the Columbia Gorge and central Washington. Some of the polyploid races appear to be alloploids involving the sympatric S. subspicatum, with larger leaves and fewer, larger heads with violet rays. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 502. | FNA vol. 20, p. 533. |
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Occidentales |
Sibling taxa | ||
Synonyms | Aster ciliolatus, Aster ciliolatus var. comatus, Aster lindleyanus, Aster wilsonii | Aster hallii, Aster chilensis subsp. hallii |
Name authority | (Lindley) Á. Löve & D. Löve: Taxon 31: 359. (1982) | (A. Gray) G. L. Nesom: Phytologia 77: 283. (1995) |
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