Symphyotrichum boreale

(Torrey & A. Gray) Á. Löve & D. Löve

Taxon 31: 358. 1982.

Common names: Rush or slender white or northern bog aster aster boréal
IllustratedEndemic
Basionym: Aster laxifolius var. borealis Torrey & A. Gray Fl. N. Amer. 2: 138. 1841
Synonyms: Aster borealis (Torrey & A. Gray) Provancher Aster franklinianus Rydberg Aster junciformis Rydberg
Treatment appears in FNA Volume 20. Treatment on page 522. Mentioned on page 468, 477, 501, 514, 521, 52.

Perennials (5.5–) 13–85 cm, colonial; slender (0.6–2.8 mm diam.), long-rhizomatous (rhizomes of season shallow or deep-seated, not producing rosettes near parent stems). Stems 1–3+, erect (straight, slender, often reddish to slightly glaucous proximally), glabrous. Leaves stiff, margins entire to sparsely subserrulate, revolute, scabrellous, apices mucronulate, sometimes with callous point, faces glabrous, abaxial midveins sometimes sparsely strigillose; basal withering by flowering, subpetiolate to petiolate, petioles winged, base dilated, sheathing, eciliate, blades linear-oblanceolate to ovate or suborbiculate, 20–150 × 5–60 mm, bases attenuate, margins shallowly serrate or entire, apices obtuse to rounded; proximal cauline withering by flowering, sessile or subpetiolate, petioles widely winged, bases strongly clasping, blades linear-lanceolate to linear, 15–90 × 2–12 mm, bases attenuate to cuneate or subauriculate, ± clasping, apices obtuse to acute; distal sessile, blades linear-lanceolate (sometimes lanceolate) to linear, (40–) 60–150 × 2–6 (–8) mm, ± reduced distally, bases subauriculate, subclasping, margins entire or sometimes remotely serrulate, apices acute. Heads borne singly or in open, often lax, racemiform or paniculiform arrays, branches ascending, sparsely leafy. Peduncles 0.5–5 cm, glabrous, bracts 1–3, remote, linear-lanceolate to linear, reduced distally, not grading into phyllaries (sometimes subtending heads). Involucres cylindro-campanulate, (4–) 5–8 mm. Phyllaries in 4–5 series, usually appressed, rarely outer recurved, lanceolate or oblong-lanceolate (outer) to linear (innermost) ± unequal to sometimes subequal, bases indurate 1/3–1/2 (sometimes not indurate), margins scarious, erose, hyaline or tinged with reddish purple, sparsely ciliolate, green zones lanceolate to linear-lanceolate, apices acute to acuminate, mucronate to apiculate, often purple or reddish purple (particularly inner), faces glabrous. Ray-florets (15–) 25–35 (–41); corollas white to often pale rose, pale-purple or lavender, laminae (7–) 10–15 (–20) × 1.1–1.5 mm. Disc-florets (15–) 25–30 (–40); corollas cream or pale-yellow becoming pink or brown purple, 3.7–6.6 mm, tubes shorter than funnelform throats, lobes triangular, 0.5–1 mm. Cypselae yellowish tan or purple to brownish with purple streaks or grayish tan (nerves stramineous), obovoid, ± compressed, 0.6–2 mm, 3–5-nerved, faces sparsely strigillose; pappi white, 2.7–6.4 mm. 2n = 16, 32, 48, 64.


Phenology: Flowering Aug–Oct.
Habitat: Mostly calcareous areas, fens, marshes, bogs, open cedar-tamarack-spruce swamps, stream and pond margins, wet meadows, swales
Elevation: 0–1500+ m

Distribution

V20-1162-distribution-map.gif

Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Colo., Idaho, Ill., Ind., Iowa, Mass., Mich., Minn., Mont., Nebr., N.H., N.J., N.Y., N.Dak., Ohio, Pa., S.Dak., Vt., Wash., W.Va., Wis., Wyo.

Discussion

Some of the western populations originally determined as Symphyotrichum boreale in western Wyoming and adjacent Montana are referable to S. welshii. Those of eastern Wyoming, Colorado, and the Black Hills are S. boreale. There is a gap between the ranges of the two species in Wyoming where neither occurs. Symphyotrichum ×longulum (E. Sheldon) G. L. Nesom (syn. Aster longulus E. Sheldon), reported from Minnesota, is the hybrid between S. boreale and S. puniceum var. puniceum.

Selected References

None.

Lower Taxa

None.
... more about "Symphyotrichum boreale"
64 +, 48 +, 32 +  and 16 +
not tailed +, rounded +  and obtuse +
winged +, subpetiolate +  and sessile +
reddish purple +  and purple +
distinct +
1.5 cm15 mm <br />0.015 m <br /> (9 cm90 mm <br />0.09 m <br />) +
subequal +
scarious +
2mm +  and 12mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, racemiform +, lax +  and open +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Torrey & A. Gray) Á. Löve & D. Löve +
subclasping +, winged +, subpetiolate +, sessile +  and petiolate +
serrate +  and sheathing +
1.5 cm15 mm <br />0.015 m <br /> (9 cm90 mm <br />0.09 m <br />) +
subauriculate +, obtuse +  and acute +
indurate +
2mm;12mm +
Aster laxifolius var. borealis +
winged +, subpetiolate +, sessile +  and petiolate +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
6 cm60 mm <br />0.06 m <br /> (15 cm150 mm <br />0.15 m <br />) +
linear-lanceolate;linear +
reduced +
2mm;6mm +
rugulose +  and muricate +
linear-lanceolate +  and linear +
reduced +
barbellulate +  and barbellate +
sessile +  and petiolate +
Rush or slender white or northern bog aster +  and aster boréal +
not 2-lipped +  and actinomorphic +
pale-yellow becoming pink or brown purple +, cream +, lavender +, pale-purple +, pale rose +  and white +
at maturity , more or less ampliate , tubes usually shorter +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.66 cm6.6 mm <br />0.0066 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
purple +  and brownish +
strigillose +  and glabrous +
compressed +, cylindric +  and obovoid or oblong +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Ill. +, Ind. +, Iowa +, Mass. +, Mich. +, Minn. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.Dak. +, Ohio +, Pa. +, S.Dak. +, Vt. +, Wash. +, W.Va. +, Wis. +  and Wyo. +
0–1500+ m +
grayish tan;grayish tan +
strigillose +  and glabrous +
compressed;obovoid;compressed;obovoid +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Mostly calcareous areas, fens, marshes, bogs, open cedar-tamarack-spruce swamps, stream and pond margins, wet meadows, swales +
disciform +  and radiate +
in open , often lax , racemiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
cylindro-campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
10mm;15mm +
2 (?) +  and 5 (?) +
1.1mm;1.5mm +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
reflexed;spreading;erect +
triangular +
winged +, subpetiolate +  and petiolate +
serrulate +, entire +, serrate +  and sheathing +
tinged with reddish purple +  and hyaline +
20mm;150mm +
ciliolate +  and eciliate +
scabrellous +
attenuate +, linear-oblanceolate +  and ovate or suborbiculate +
5mm +  and 60mm +
2-carpellate +
persistent +
25 +  and 40 +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.64 cm6.4 mm <br />0.0064 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 m <br />) +
winged +, subpetiolate +, sessile +  and petiolate +
serrate +  and sheathing +
15mm;90mm +
obtuse +  and acute +
Flowering Aug–Oct. +
oblong-lanceolate +  and linear +
subequal +, unequal to sometimes +  and unequal +
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 +
Illustrated +  and Endemic +
branched +  and simple +
1 +  and 3 +
appendaged +  and truncate +
papillate +  and smooth +
Aster borealis +, Aster franklinianus +  and Aster junciformis +
Symphyotrichum boreale +
Symphyotrichum sect. Symphyotrichum +
species +
funnelform-campanulate +  and cylindric +
ampliate +
5.5 cm55 mm <br />0.055 m <br /> (13 cm130 mm <br />0.13 m <br />) +
13 cm130 mm <br />0.13 m <br /> (85 cm850 mm <br />0.85 m <br />) +
tree +, shrub +  and subshrub +
lanceolate +  and linear-lanceolate +