Symphyotrichum hallii

(A. Gray) G. L. Nesom

Phytologia 77: 283. 1995.

Common names: Hall’s aster
Endemic
Basionym: Aster hallii A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 191. 1884
Synonyms: Aster chilensis subsp. hallii (A. Gray) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 533. Mentioned on page 469, 534, 537.

Perennials, 30–60 cm, colonial; long-rhizomatous. Stems 1–6, ascending to erect, glabrous or puberulent, especially distally. Leaves 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. Heads in racemiforn to paniculiform arrays, branches usually less than 10 (–20) cm. Peduncles sparsely to densely hairy, bracts 3–10, linear to narrowly elliptic, much smaller than distal leaves. Involucres campanulate, 4–7 mm. Phyllaries 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. Ray-florets 14–35; corollas usually white, sometimes pale violet, laminae 7–12 × 1–2 mm. Disc-florets 20–35; corollas yellow, 4.5–6.5 mm, lobes triangular, 0.7–1 mm, glabrous. Cypselae brown, cylindric to obovoid, not compressed, 2–2.5 mm, 2–5-nerved, faces hairy; pappi white, 5–7 mm. 2n = 16, 32, 48.


Phenology: Flowering Jul–Aug.
Habitat: Summer-dry grasslands and meadows
Elevation: 0–500 m

Discussion

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.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Symphyotrichum hallii"
48 +, 32 +  and 16 +
not tailed +, rounded +  and obtuse +
distinct +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
subequal +
scarious +
2mm +  and 8mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(A. Gray) G. L. Nesom +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
cuneate +, acute +, linear +  and narrowly oblanceolate +
scarious +  and herbaceous +
2mm;8mm +
Aster hallii +
sessile +  and petiolate +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
acute;cuneate;linear;narrowly oblanceolate +
2mm;8mm +
rugulose +  and muricate +
linear +  and narrowly elliptic +
much smaller +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
barbellulate +  and barbellate +
sessile +  and petiolate +
Hall’s aster +
not 2-lipped +  and actinomorphic +
yellow +, pale violet +  and white +
at maturity , more or less ampliate , tubes usually shorter +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
strigillose +  and glabrous +
not compressed +, cylindric +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
Oreg. +  and Wash. +
0–500 m +
hairy +  and glabrous +
scabridulous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Summer-dry grasslands and meadows +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
2 (?) +  and 5 (?) +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
triangular +
not +  and hyaline +
10mm;60mm +
ciliate +  and scabrous +
attenuate +, narrowly oblanceolate +  and linear +
2mm +  and 10mm +
2-carpellate +
persistent +
25 +  and 40 +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Flowering Jul–Aug. +
narrowly oblanceolate +  and linear +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.1mm;0.2mm +
branched +  and simple +
ascending +  and erect +
1 +  and 6 +
appendaged +  and truncate +
papillate +  and smooth +
Aster chilensis subsp. hallii +
Symphyotrichum hallii +
Symphyotrichum sect. Occidentales +
species +
funnelform-campanulate +  and cylindric +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
tree +, shrub +  and subshrub +
ovate +  and linear +