Symphyotrichum prenanthoides (Muhlenberg ex Willdenow) G. L. Nesom (Q2423)

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

    Statements

    taxon/id/Symphyotrichum prenanthoides (Muhlenberg ex Willdenow) G.L. Nesom
    0 references
    Symphyotrichum prenanthoides (Muhlenberg ex Willdenow) G.L. Nesom
    Symphyotrichum prenanthoides
    (Muhlenberg ex 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 prenanthoides
    (Muhlenberg ex Willdenow) G.L. Nesom
    aster fausse-prenanthe (French)
    crooked-stem aster (English)
    Crookedstem aster (English)
    1 reference
    Newmaster, S.G., A. Lehela, M.J. Oldham, P.W.C. Uhlig & S. McMurray. 1998. Ontario Plant List. Ontario Forest Research Institute, Sault Ste. Marie, Ontario. Forest Information Paper No. 123. 550 pp.
    Flowering Aug–Oct.
    swampy grounds
    thickets
    meadows
    stream banks
    roadsides
    Stems 1 (–3+), ascending to erect (usually flexuous, sometimes ± straight, sometimes stout, older often dark purple), glabrous proximally, moderately hirsute distally.
    Leaves thin, margins scabrous, apices mucronate, abaxial faces glabrous, midveins hispid to glabrate, adaxial scabrous;
    basal withering by flowering, petiolate (petioles slender or slightly winged, bases reddish, dilated, sheathing, ciliate), blades obovate to oblanceolate, 15–70 × 10–20 mm, bases attenuate, margins crenate-serrate, apices acute to obtuse;
    proximalmost cauline withering by flowering, proximal mostly persistent, petiolate to subpetiolate (petioles ± widely winged, bases dilated, strongly auriculate-clasping), blades ovate to lanceovate or elliptic-lanceolate to oblanceolate, 80–160 (–200) × 15–55 mm, progressively reduced distally, bases attenuate, margins sharply serrate (teeth mucronulate), apices acuminate to subcaudate;
    distal subpetiolate or sessile (petioles broadly winged, auriculate-clasping), blades oblanceolate to lanceolate, sometimes panduriform, 7–90 × 2–25 mm, progressively reduced distally, more sharply so on branches, bases attenuate (petiolate) or ± cuneate to auriculate-clasping and slightly constricted above auricles (panduriform), margins serrate or entire.
    Heads in broad, ± flat, corymbo-paniculiform arrays, branches often purplish, divaricate to ascending, slender.
    Peduncles (8–) 10–40 mm, sparsely to densely hispid, bracts lanceolate to linear-lanceolate, 3–12 mm, somewhat grading into phyllaries.
    Involucres campanulate, 5–6 mm.
    Phyllaries in 4–6 series, oblong-lanceolate or oblanceolate, slightly constricted near middle (outer) to linear-lanceolate or linear (inner), ± unequal (flexible), bases indurate 1/5–1/2, margins ± narrowly hyaline, scarious, erose, sometimes ciliolate distally, green zones lanceolate to linear-lanceolate (inner), often distally foliaceous, sometimes outer ± entirely so, apices spreading to ± squarrose, acute to acuminate, mucronulate, abaxial faces sparsely hirsutulous to glabrate or glabrous, adaxial glabrous or sparsely hirsutulous.
    Ray-florets 17–25 (–30);
    corollas usually lavender to blue, rarely white, laminae 7.5–12 (–15) × 1–2 mm.
    Disc-florets 39–50 (–65);
    corollas cream colored or light yellow becoming purple or brown, 3.5–5 mm, tubes ± equaling campanulate to funnelform throats (thinly puberulent), lobes triangular, 0.5–1 mm.
    Cypselae dull purple or stramineous with purple streaks or purplish-tinged, cylindro-oblanceoloid to obovoid, ± compressed, 2–3 (–3.5) mm, 4–6-nerved, faces sparsely to moderately strigillose;
    pappi sordid, 3.5–4.5 mm. 2n = 32.