Leaves lanceolate to ovate, conspicuously auriculate-clasping, less than 5 times as long as wide. Phyllaries strongly unequal, apical green zones diamond-shaped. 2n = 48.


Phenology: Flowering (Jul–)Aug–Oct.
Habitat: Open, dry habitats, mixed- and tallgrass prairies, open, dry oak and other deciduous forests, glades and alvars, roadsides
Elevation: 0–1000+ m

Distribution

V20-1134-distribution-map.gif

Man., N.B., Ont., Que., Ala., Ark., Conn., Del., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mo., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Pa., R.I., S.Dak., Tenn., Vt., Va., W.Va., Wis., in Mexico, West Indies, Central America, South America, Europe

Discussion

Variety laeve is found in the tallgrass prairies area and midwestern deciduous forest, mainly west of the Appalachian Mountains, but reaching the Atlantic from New Jersey to New England. It was introduced in Quebec and New Brunswick; it is also widely introduced outside North America. It is sold in the horticultural trade. Aster laevis forma beckwithiae House is a white-rayed phenotype that is not recognized here.

Hybrids of this variety have been reported with Symphyotrichum ciliolatum, S. cordifolium, S. drummondii, S. lanceolatum, S. lateriflorum, S. oolentangiense, and S. urophyllum. The hybrid with S. praealtum was described as Aster novi-belgii Linnaeus var. litoreus A. Gray [S. novi-belgii var. litoreum (A. Gray) G. L. Nesom; J. Labrecque and L. Brouillet 1996]. Symphyotrichum ×versicolor (Willdenow) G. L. Nesom (Aster versicolor Willdenow) is the hybrid between S. laeve var. laeve and S. novi-belgii var. novi-belgii. It is of garden origin and has escaped locally in Europe but has not been reported in North America.

Symphyotrichum ×gravesii (E. S. Burgess) G. L. Nesom (Aster gravesii E. S. Burgess), originally reported from Connecticut, may be the hybrid between S. laeve var. laeve and S. dumosum, though annotations suggest that the second parent might be S. cordifolium. Symphyotrichum ×woldenii (Rydberg) G. L. Nesom (Aster woldenii Rydberg), initially reported from Iowa, is possibly the hybrid between S. laeve var. laeve and S. praealtum, or S. oolentangiense and S. praealtum. The question of exact parentage is unresolved.

Distinction between var. laeve and var. geyeri is based on phyllary morphology. The two varieties appear to intergrade in the northeastern prairies but are mostly well defined at the extremes of the range, though plants in the western United States sometimes appear similar to var. laeve. These varieties are much more similar to each other than either is to var. concinnum or var. purpuratum and should be grouped in subsp. laeve. Alternately, var. geyeri could be considered a synonym of var. laeve.

Selected References

None.

Lower Taxa

None.

"thick" is not a number."thick" is not a number.

not tailed +, rounded +  and obtuse +
auriculate-clasping +
crenate-serrate +  and entire +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
persistent +
distinct +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 m <br />) +
crenate-serrate to serrulate +
subequal +
scarious +
10mm +  and 25mm +
usually triangular +  and linear +
diamond--shaped +
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† +
(Linnaeus) Á. Löve & D. Löve +
sessile +, subsessile +  and petiolate +
crenate-serrate +  and entire +
15 cm150 mm <br />0.15 m <br /> (18 cm180 mm <br />0.18 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
persistent +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
rounded +, auriculate +  and attenuate +
crenate-serrate to serrulate +
indurate +
20mm;45mm +
Aster laevis +
sessile +, subsessile +  and petiolate +
15 cm150 mm <br />0.15 m <br /> (18 cm180 mm <br />0.18 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
persistent +
0.7 cm7 mm <br />0.007 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
lanceolate;linear +
crenate-serrate to serrulate +
reduced +
1mm;14mm +
rugulose +  and muricate +
linear-lanceolate +  and linear +
reduced +  and small +
barbellulate +  and barbellate +
sessile +  and petiolate +
not 2-lipped +  and actinomorphic +
yellow turning purplish red +, white +, usually pale +  and dark blue or purple +
at maturity , more or less ampliate , tubes usually shorter +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.61 cm6.1 mm <br />0.0061 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
purple +  and brown +
strigillose +  and glabrous +
compressed +  and oblong-obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
Man. +, N.B. +, Ont. +, Que. +, Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Pa. +, R.I. +, S.Dak. +, Tenn. +, Vt. +, Va. +, W.Va. +, Wis. +, in Mexico +, West Indies +, Central America +, South America +  and Europe +
0–1000+ m +
glabrate +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, dry habitats, mixed- and tallgrass prairies, open, dry oak and other deciduous forests, glades and alvars, roadsides +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
campanulate;cylindro-campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1.13 cm11.3 mm <br />0.0113 m <br /> (1.46 cm14.6 mm <br />0.0146 m <br />) +
7.2mm;11.3mm +
2 (?) +  and 5 (?) +
1.5mm;2.5mm +
sessile +  and petiolate +
auriculate-clasping +
cauline +  and basal +
lanceolate;ovate +
fleshy +  and firm +
decurrent +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
reflexed;spreading;erect +
triangular +
entire +, crenate-serrate +  and serrulate +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
persistent +
30mm;200mm +
scabridulous +
obtuse +, acute +  and obtuse or rounded +
crenate-serrate to serrulate +
10mm +  and 25mm +
2-carpellate +
tawny +  and red or rose-tinged +
persistent +
25 +  and 40 +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
puberulent +, glabrous +  and glaucous +
0.2 cm2 mm <br />0.002 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering (Jul–)Aug–Oct. +
oblanceolate +, linear-lancolate +, lanceolate +  and oblong-lanceolate +
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 +
1 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Aster sect. Heterastrum +  and Aster subg. Symphyotrichum +
Symphyotrichum laeve var. laeve +
Symphyotrichum laeve +
variety +
funnelform-campanulate +  and cylindric +
ampliate +
70 cm700 mm <br />0.7 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
tree +, shrub +  and subshrub +
mostly diamond-shaped +  and more or less lanceolate +