Symphyotrichum lanceolatum var. hesperium

(A. Gray) G. L. Nesom

Phytologia 77: 284. 1995.

Basionym: Aster hesperius A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 192. 1884
Synonyms: Aster coerulescens var. wootonii (Greene) Wiegand Aster durus Lunell Aster fluvialis Osterhout Aster hesperius var. wootonii Greene Aster lanceolatus subsp. hesperius (A. Gray) Semple & Chmielewski Aster lautus Rydberg Aster osterhoutii (Greene) Greene Aster wootonii (A. Gray) Á. Löve and D. Löve Symphyotrichum hesperium
Treatment appears in FNA Volume 20. Treatment on page 520. Mentioned on page 519.

Stems stout, glabrous or at most hairy in lines. Leaf-blades linear-lanceolate or oblanceolate, proximal cauline margins shallowly serrate, mid to distal entire. Heads 1–100+, borne singly or congested at ends of lateral branches, usually subtended by large foliaceous bracts. Involucres 4–7.2 mm. Phyllaries: outer 2.6–6.3 × 0.4–1 mm, inner 4–7.4 × 0.2–1.1 mm, outer 2/3+ length of inner. Ray-florets 18–45; corollas usually pale to dark purplish blue, sometimes white, laminae 4.2–10.1 mm. Disc-florets 18–52; corollas 3.3–5.7 mm, limbs 2–3.8 mm, lobes 0.5–1.1 mm. Cypselae 0.7–2.7; pappi 3.7–6.4 mm. 2n = 64.


Phenology: Flowering Jul–Oct.
Habitat: Along streams and banks in prairies, wet meadows, open conifer forests in montane zone, often calcareous soils, roadside ditches
Elevation: 10–2700 m

Distribution

V20-1156-distribution-map.gif

Alta., B.C., Man., N.W.T., Ont., Que., Sask., Ariz., Calif., Colo., Idaho, Iowa, Kans., Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Okla., Oreg., S.Dak., Tex., Utah, Wash., Wis., Wyo., Mexico (Baja California), Mexico (Chihuahua), Mexico (Sonora)

Discussion

Variety hesperium is present at the northeastern limit of its range in Quebec only on the clays of the southern James Bay; a report of introduction in the Gatineau area is attributable to Symphyotrichum robynsianum. In north-central Ontario, it is found mainly in areas of clay deposits or in calcareous stream valleys, but not in the Clay Belt, reaching the southern James Bay. This variety has been treated mostly as a distinct species in floras. Character ranges overlap considerably with var. lanceolatum, and it is often difficult to distinguish the two entities where their distributions overlap. In areas of sympatry, the two taxa hybridize to form septaploid plants (2n = 56).

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

scabrous +  and glabrous +
not tailed +, rounded +  and obtuse +
petiolate +  and subpetiolate +
distinct +
1 cm10 mm <br />0.01 m <br /> (8 cm80 mm <br />0.08 m <br />) +
subequal +
scarious +
5mm +  and 20mm +
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† +
(A. Gray) G. L. Nesom +
cuneate +  and decurrent +
indurate +
Aster hesperius +
subsessile +, sessile +, petiolate +  and subpetiolate +
10 cm100 mm <br />0.1 m <br /> (14 cm140 mm <br />0.14 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1 cm10 mm <br />0.01 m <br /> (8 cm80 mm <br />0.08 m <br />) +
oblanceolate;linear +
reduced +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
10mm;20mm +
rugulose +  and muricate +
linear-oblanceolate +  and lanceolate +
barbellulate +  and barbellate +
sessile +  and petiolate +
not 2-lipped +  and actinomorphic +
white +, blue +, usually pale +  and dark purplish +
at maturity , more or less ampliate , tubes usually shorter +
0.33 cm3.3 mm <br />0.0033 m <br /> (0.57 cm5.7 mm <br />0.0057 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
tan +  and gray +
strigillose +  and glabrous +
0.7 +  and 2.7 +
compressed +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Que. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Iowa +, Kans. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, Okla. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wis. +, Wyo. +, Mexico (Baja California) +, Mexico (Chihuahua) +  and Mexico (Sonora) +
10–2700 m +
strigillose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Along streams and banks in prairies, wet meadows, open conifer forests in montane zone, often calcareous soils, roadside ditches +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.74 cm7.4 mm <br />0.0074 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
campanulate;cylindric +
0.4 cm4 mm <br />0.004 m <br /> (0.72 cm7.2 mm <br />0.0072 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
2 (?) +  and 5 (?) +
0.42 cm4.2 mm <br />0.0042 m <br /> (1.01 cm10.1 mm <br />0.0101 m <br />) +
0.5mm;1.3mm +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
triangular +
petiolate +  and subpetiolate +
entire +, serrate +  and crenate-serrate +
10mm;80mm +
acute +  and obtuse or rounded +
5mm +  and 20mm +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.63 cm6.3 mm <br />0.0063 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
2-carpellate +
white +  and sordid or tawny +
persistent +
25 +  and 40 +
0.37 cm3.7 mm <br />0.0037 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 />) +
Flowering Jul–Oct. +
spreading +  and appressed +
dilated +, linear-lanceolate +  and linear +
less strongly unequal +  and subequal +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
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 +
branched +  and simple +
appendaged +  and truncate +
papillate +  and smooth +
Aster coerulescens var. wootonii +, Aster durus +, Aster fluvialis +, Aster hesperius var. wootonii +, Aster lanceolatus subsp. hesperius +, Aster lautus +, Aster osterhoutii +, Aster wootonii +  and Symphyotrichum hesperium +
Symphyotrichum lanceolatum var. hesperium +
Symphyotrichum lanceolatum +
variety +
funnelform-campanulate +  and cylindric +
ampliate +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
30 cm300 mm <br />0.3 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
tree +, shrub +  and subshrub +
lanceolate +  and linear-lanceolate +