Symphyotrichum Nees (Q2413)

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Symphyotrichum is a taxon with the rank genus within the tribe Astereae
Language Label Description Also known as
English
Symphyotrichum Nees
Symphyotrichum is a taxon with the rank genus within the tribe Astereae

    Statements

    taxon/id/Symphyotrichum Nees
    0 references
    Symphyotrichum Nees
    Symphyotrichum
    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
    Aster (English)
    North America
    Mexico
    West Indies
    Central America
    South America
    e Eurasia
    in Europe
    Stems ascending to erect, rarely vinelike, usually simple, sometimes branched distally, seldom proximally, usually hairy in decurrent lines at least distally, proximally often glabrous, sometimes hairy, sometimes stipitate-glandular distally.
    petiolate (often basal and proximal, sometimes distal, petioles often ± winged, clasping, ciliate) or sessile;
    blades (often purplish abaxially, 1, sometimes to 3-nerved) cordate to elliptic, oblanceolate, or spatulate (basal), ovate, elliptic, lanceolate, oblanceolate, or linear (cauline, usually progressively, sometimes abruptly or little reduced distally), margins serrate, crenate, or entire, scabrous or ciliate, faces glabrous or hairy, sometimes stipitate-glandular.
    Heads radiate or disciform (sect. Conyzopsis), usually in paniculiform, sometimes in racemiform or subcorymbiform arrays, sometimes borne singly.
    Involucres cylindric or campanulate to hemispheric, 4–22 mm diam.
    Phyllaries 20–84 in (3–) 4–6 (–9) series, 1 (–3) -nerved (not keeled), oblong-lanceolate or oblanceolate or spatulate (outer and mid) to linear (innermost), unequal to subequal, outer sometimes foliaceous, bases usually indurate, margins usually scarious, erose, hyaline or not, (apices usually with a well-defined green zone, sometimes ± foliaceous), faces glabrous or hairy, sometimes stipitate-glandular.
    Receptacles flat to slightly convex, pitted, epaleate.
    usually in 1 series, in 2–5 series, rarely in 4–5+ series in S. frondosum, pistillate, fertile;
    corollas white, pink, blue, or purple (rays 0, peripheral pistillate florets in 2–5+ series, corollas lacking laminae in sect. Conyzopsis).
    Disc-florets (7–) 15–50 (–110), bisexual, fertile;
    corollas yellow to white, becoming purplish to reddish or pinkish at maturity, ± ampliate, tubes usually shorter than funnelform (cylindric in sect. Conyzopsis) throats, lobes 5, erect, spreading, or reflexed, deltate, triangular, or lanceolate;
    style-branch appendages lanceolate.
    Cypselae usually obovoid or obconic, sometimes fusiform, ± compressed, nerves (2–) 3–5 (–10, sometimes dark-translucent), faces glabrous or strigillose, eglandular (sparsely stipitate-glandular in S. novae-angliae);
    pappi persistent, of (20–) 25–40 (–55) white to brownish, ± equal, barbellate, apically attenuate bristles in 1 (–3) series.
    x = 8, 7, 5, 13, 18, 21.