Symphyotrichum pilosum (Willdenow) G. L. Nesom (Q2450)

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Symphyotrichum pilosum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum
Language Label Description Also known as
English
Symphyotrichum pilosum (Willdenow) G. L. Nesom
Symphyotrichum pilosum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum

    Statements

    taxon/id/Symphyotrichum pilosum (Willdenow) G.L. Nesom
    0 references
    Symphyotrichum pilosum (Willdenow) G.L. Nesom
    Symphyotrichum pilosum
    (Willdenow) G.L. Nesom
    FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 20: Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford University Press, New York.
    accepted
    Symphyotrichum pilosum
    old field aster (English)
    white old field aster (English)
    white heath aster (English)
    hairy aster (English)
    hairy white old field aster (English)
    frostweed (English)
    awl aster (English)
    aster poilu (French)
    Oldfield or frost weed or white oldfield or hairy or hairy white oldfield aster (English)
    aster poilu (English)
    with stout, branched caudices, sometimes long-rhizomatous.
    Stems 1–5+, ascending to erect (straight, stout), glabrate to hirsuto-hispid or pilose, sometimes glabrous or hairy in lines (var. pringlei).
    Leaves thin, margins ciliate, apices acute to acuminate, mucronate, faces glabrous or ± hirsute (particularly on abaxial midveins);
    basal withering by flowering (new vernal rosettes developing at flowering), petiolate to subpetiolate (petioles winged, ciliate, bases sheathing), blades oblanceolate or obovate to spatulate, 10–60 × 5–15 mm, bases attenuate, margins sparsely crenate-serrate (mostly apically), apices obtuse to rounded;
    proximal cauline usually deciduous at flowering (often with axillary clusters of small leaves), petiolate or subpetiolate to subsessile (petioles narrowly to broadly winged, clasping), blades elliptic-oblanceolate or oblong to linear-lanceolate or oblanceolate, 40–102 × 5–25 mm, progressively reduced distally, bases attenuate to cuneate, ± clasping, margins entire to serrate, softly ciliate, apices attenuate, hyaline-spinulose;
    distal sessile, blades lance-oblong to linear-lanceolate to linear or linear-oblanceolate or linear-subulate, 10–100 × 1–8 mm, progressively reduced distally, branch leaves abruptly smaller, bases cuneate, margins entire or serrulate.
    Heads in open, leafy, often pyramidal, paniculiform arrays, branches divaricate or branches 10 cm or less ascending, often arched and secund, sometimes racemiform.
    Peduncles 5–30 (–50) mm, progressively shorter distally, glabrous or densely hispid, bracts 7–25+, appressed to ascending, sometimes ± spreading, linear to subulate, glabrate, ciliate or not, mucronate to apiculate, ± grading into phyllaries.
    Involucres campanulate to cylindro-campanulate, (2.5–) 3.5–5.1 (–6.5) mm.
    Phyllaries in 4–6 series, appressed or slightly spreading, oblong-lanceolate (outer) to linear (innermost), unequal (rarely subequal), bases indurate 1/2–3/5, margins hyaline, scarious, erose, ± ciliolate distally, green zones lanceolate to lance-rhombic, apices acute or acuminate, involute, spinulose, faces glabrous or sparsely hirsutulous.
    Ray-florets (10–) 16–28 (–38);
    corollas usually white, rarely pinkish or bluish, laminae (4–) 5.4–7.5 (–11) × (0.4–) 0.8–1.3 (–1.7) mm.
    Disc-florets (13–) 17–39 (–67);
    corollas light yellow becoming reddish purple or brown, (2.5–) 3–4.1 (–5.5) mm, tubes much shorter than narrowly funnelform throats, lobes lanceolate, (0.4–) 0.6–0.8 (–1) mm.
    Cypselae whitish or gray, oblong-obovoid, sometimes ± compressed, 1–1.5 × 0.5–0.7 mm, 4–6-nerved, faces sparsely strigillose;
    pappi white, 3.5–4 mm.