Symphyotrichum bracteolatum

(Nuttall) G. L. Nesom

Phytologia 77: 276. 1994.

Common names: Eaton’s aster
Basionym: Aster foliaceus var. eatonii Nuttall Trans. Amer. Philos. Soc. ser. 2, 7: 293. 1840
Synonyms: Aster bracteolatus Nuttall Aster eatonii (A. Gray) Howell
Treatment appears in FNA Volume 20. Treatment on page 531. Mentioned on page 469, 475, 477, 534, 537.

Perennials 40–100 cm, cespitose; short-rhizomatous. Stems 1–10+, ascending to erect, glabrous or sparsely puberulent. Leaves thin, margins entire or sometimes serrate, apices acute; basal withering by flowering, petiolate, blades narrowly lanceolate, 60–200 × 10–20 mm, attenuate or cuneate, margins usually entire, sometimes serrate, apices acute, faces glabrous or sparsely puberulent; proximalmost cauline sometimes withering by flowering, sessile, blades narrowly lanceolate, 50–150 × 8–25 mm, bases cuneate, often auriculate, apices acute; distal sessile, blades linear to narrowly lanceolate, 20–120 × 3–20 mm, bases cuneate, often auriculate, apices acute. Heads in racemiform to narrow, paniculiform arrays, branches usually to 10 cm. Peduncles sparsely hairy, bracts linear to lanceolate. Involucres campanulate, 5–8 mm. Phyllaries in 3–5 series, often spreading, oblanceolate (outer) to linear (inner), subequal, outer indurate less than 1/2, bases outer variable, inner scarious, margins entire, scabrous to ciliolate, green zones oblanceolate to elliptic, apices acute to obtuse, often spreading, faces glabrous or sparsely puberulent. Ray-florets 20–40; corollas white to pink, laminae 7–15 × 1–2 mm. Disc-florets 35–60+; corollas yellow, 4.5–5 mm, lobes triangular, 0.5–0.75 mm. Cypselae brown, cylindric to obovoid, not compressed, 2.5–3.5 mm, 1–2-nerved, faces hairy; pappi white, 5–6 mm. 2n = 16, 32, 48, 64.


Phenology: Flowering Jul–Aug.
Habitat: Moist to wet sunny places, wet thickets, along streams and ditches
Elevation: 500–3100 m

Distribution

V20-1181-distribution-map.gif

Alta., B.C., Sask., Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

64 +, 48 +, 32 +  and 16 +
not tailed +, rounded +  and obtuse +
sessile +  and petiolate +
serrate +  and entire +
distinct +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
puberulent +  and glabrous +
subequal +
scarious +
8mm +  and 25mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Nuttall) G. L. Nesom +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
auriculate +, cuneate +, acute +  and lanceolate +
indurate +
8mm;25mm +
Aster foliaceus var. eatonii +
sessile +  and petiolate +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
puberulent +  and glabrous +
linear;narrowly lanceolate +
3mm;20mm +
rugulose +  and muricate +
linear +  and lanceolate +
barbellulate +  and barbellate +
sessile +  and petiolate +
Eaton’s aster +
not 2-lipped +  and actinomorphic +
yellow +, white +  and pink +
at maturity , more or less ampliate , tubes usually shorter +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
strigillose +  and glabrous +
not compressed +, cylindric +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
500–3100 m +
serrate +  and entire +
6 cm60 mm <br />0.06 m <br /> (20 cm200 mm <br />0.2 m <br />) +
hairy +, puberulent +  and glabrous +
acute;cuneate;attenuate;lanceolate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Moist to wet sunny places, wet thickets, along streams and ditches +
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 +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 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 +
entire +  and serrate +
not +  and hyaline +
60mm;200mm +
scabrous +  and ciliolate +
acute +, cuneate +, attenuate +  and lanceolate +
10mm +  and 20mm +
2-carpellate +
persistent +
25 +  and 40 +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering Jul–Aug. +
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 10 +
appendaged +  and truncate +
papillate +  and smooth +
Aster bracteolatus +  and Aster eatonii +
Symphyotrichum bracteolatum +
Symphyotrichum sect. Occidentales +
species +
funnelform-campanulate +  and cylindric +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
40 cm400 mm <br />0.4 m <br /> (100 cm1,000 mm <br />1 m <br />) +
tree +, shrub +  and subshrub +
oblanceolate +  and elliptic +