Symphyotrichum laeve

(Linnaeus) Á. Löve & D. Löve

Taxon 31: 359. 1982.

Common names: Smooth aster aster lisse
Basionym: Aster laevis Linnaeus Sp. Pl. 2: 876. 1753
Treatment appears in FNA Volume 20. Treatment on page 508. Mentioned on page 473, 475, 500, 510, 521, 537.

Perennials (15–)20–70(–120) cm, cespitose; stoutly short-rhizomatous, with thick, woody caudices or a few, long rhizomes. Stems 1–5+, erect (straight, glaucous, sometimes reddish proximally), glabrous, sometimes sparsely hirsute distally. Leaves (glaucous) thick, firm, ± fleshy, margins crenate-serrate or -serrulate or entire, scabridulous, apices mucronulate, faces glabrous; basal usually withering by flowering or sometimes persistent (var. purpuratum), petiolate (petioles ± winged, bases dilated, sheathing), blades spatulate or oblong to ovate or lanceolate-ovate, 30–200 × 10–25(–30) mm, bases attenuate or cuneate to rounded, margins crenate-serrate to serrulate, apices acute to obtuse or rounded; proximal cauline often withering by flowering, petiolate or subsessile or sessile (petioles narrowly to broadly winged, clasping), blades ovate or oblong-ovate to lanceolate or linear-lanceolate, sometimes ± panduriform, (40–)80–150(–180) × (10–)20–45 mm, bases attenuate to rounded or ± shallowly auriculate-clasping, margins entire or shallowly crenate-serrate, minutely scabrous, apices acute or obtuse, callus-pointed; distal sessile, blades lance-ovate or lanceolate to linear, 7–45 × 1–14 mm, progressively reduced distally (abruptly so in arrays), bases auriculate and ± clasping to rounded, margins entire. Heads in broad, sometimes ± flat-topped, paniculiform arrays, branches stiffly ascending (rarely arching), leafy with small, gradually reduced branch leaves. Peduncles 0.2–6+ cm, glaucous, glabrous or puberulent in lines, bracts 3–6, densely spaced, subulate or linear-lanceolate to linear, subclasping, apices sometimes purplish, grading into phyllaries. Involucres campanulate to cylindro-campanulate, (4.2–)5–7(–8) mm. Phyllaries in 4–6 series, appressed, subulate or lanceolate (outer) to oblong-lanceolate or linear-lancolate or -oblanceolate, unequal (sometimes appearing subequal), bases indurate 1/2–3/4, margins scarious, erose, hyaline, ciliolate distally, green zones mostly diamond-shaped to ± lanceolate (some inner, or most in var. geyeri), apices acute to acuminate, sometimes ± obtuse, red-mucronate or apiculate, faces glabrous. Ray florets (11–)13–23(–34); corollas usually pale to dark blue or purple, seldom white, laminae (6–)7.2–11.3(–14.6) × 1.5–2.5 mm. Disc florets (17–)19–33(–43); corollas yellow turning purplish red, 3.5–6.1 mm, tubes slightly shorter than funnelform throats, lobes triangular, (0.4–)0.6–1 mm. Cypselae deep purple to brown, oblong-obovoid, compressed, 2–3.5 mm, 4–5-nerved, faces glabrous or glabrate; pappi tawny to red- or rose-tinged, 5–7 mm.



Alta., B.C., Man., N.B., Ont., Que., Sask., Yukon, Ala., Ark., Calif., Colo., Conn., D.C., Del., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Mass., Md., Mich., Minn., Miss., Mo., Mont., N.C., N.Dak., N.H., N.J., N.Mex., N.Y., Nebr., Nev., Ohio, Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Va., Vt., W.Va., Wash., Wis., Wyo., ne Mexico, introduced in other areas of Mexico, Central America, Europe.


Varieties 4 (4 in the flora).

Selected References



1 Leaves lanceolate to ovate, conspicuously auriculate-clasping, lengths less than 5 times widths > 2
1 Leaves linear-lanceolate to linear, slightly auriculate-clasping, lengths often 5 times widths > 3
2 Phyllaries strongly unequal, green apical zones diamond-shaped Symphyotrichum laeve var. laeve
2 Phyllaries unequal, green apical zones lanceolate Symphyotrichum laeve var. geyeri
3 Basal leaves withering by flowering, cauline linear-lanceolate Symphyotrichum laeve var. concinnum
3 Leaves mostly basal and proximal at flowering, mostly linear Symphyotrichum laeve var. purpuratum
... more about "Symphyotrichum laeve"
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Linnaeus) Á. Löve & D. Löve +
Aster laevis +
Smooth aster +  and aster lisse +
Alta. +, B.C. +, Man. +, N.B. +, Ont. +, Que. +, Sask. +, Yukon +, Ala. +, Ark. +, Calif. +, Colo. +, Conn. +, D.C. +, Del. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Mass. +, Md. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, N.C. +, N.Dak. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, Nebr. +, Nev. +, Ohio +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Va. +, Vt. +, W.Va. +, Wash. +, Wis. +, Wyo. +, ne Mexico +, introduced in other areas of Mexico +, Central America +  and Europe. +
Aster sect. Heterastrum +  and Aster subg. Symphyotrichum +
Symphyotrichum laeve +
Symphyotrichum sect. Symphyotrichum +
species +