All Floras      Advanced Search
FNA Vol. 20 Page 473,475, 500, 508, 510, 521, 537 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 20 | Asteraceae | Symphyotrichum

36. Symphyotrichum laeve (Linnaeus) Á. Löve & D. Löve, Taxon. 31: 359. 1982.

Smooth aster, aster lisse

Aster laevis Linnaeus, Sp. Pl. 2: 876. 1753

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.

Varieties 4 (4 in the flora): North America, ne Mexico; introduced in other areas of Mexico, Central America, Europe.

1 Leaves lanceolate to ovate, conspicuously auric­ulate-clasping, lengths less than 5 times widths   (2)
+ Leaves linear-lanceolate to linear, slightly auriculate-clasping, lengths often 5 times widths   (3)
2 (1) Phyllaries strongly unequal, green apical zones diamond-shaped   36a Symphyotrichum laeve var. laeve
+ Phyllaries unequal, green apical zones lanceolate   36b Symphyotrichum laeve var. geyeri
3 (1) Basal leaves withering by flowering, cauline linear-lanceolate   36c Symphyotrichum laeve var. concinnum
+ Leaves mostly basal and proximal at flowering, mostly linear   36d Symphyotrichum laeve var. purpuratum


Related Objects  
  • Distribution Map
  • Map

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |