Symphyotrichum undulatum (Linnaeus) G. L. Nesom (Q2428)

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Symphyotrichum undulatum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum
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English
Symphyotrichum undulatum (Linnaeus) G. L. Nesom
Symphyotrichum undulatum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum

    Statements

    taxon/id/Symphyotrichum undulatum (Linnaeus) G.L. Nesom
    0 references
    Symphyotrichum undulatum (Linnaeus) G.L. Nesom
    Symphyotrichum undulatum
    (Linnaeus) 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 undulatum
    aster ondulé (French)
    wavy-leaved aster (English)
    Wavyleaf aster (English)
    1 reference
    Morton, J.K., & J.M. Venn. 1990. A checklist of the flora of Ontario: vascular plants. University of Waterloo Biology series 34. 218 pp.
    1 reference
    Zinck, M. 1998. Roland's Flora of Nova Scotia. Nimber Publishing & Nova Scotia Museum. Halifax, N. S. 2 vols. 1297 pp.
    Flowering Aug–Oct.
    rocky soils
    open decidous woods
    borders
    clearings
    dry hammocks
    sandhills
    open-wooded bluffs
    sandstone
    limestone
    200–1500 m
    short-rhizomatous or with branched, woody caudices.
    Stems 1–3+, erect (straight, brittle), hirtellous to glabrescent proximally to densely hirtellous distally.
    Leaves thin, margins scabrous, abaxial faces hirtellous, densely so on midveins, adaxial usually scabrous, sometimes strigose or hirsute, rarely glabrate;
    basal withering by flowering (sometimes new winter rosette developing), petiolate (petioles purplish, narrowly winged, bases dilated and sheathing, hirsute), blades oblong-ovate or ovate to widely ovate, (10–) 35–60 (–140) × (10–) 15–70 mm, bases usually cordate or subcordate to rounded, sometimes attenuate, margins shallowly crenate-serrate to subentire, apices obtuse or rounded, mucronulate;
    proximalmost cauline withering by flowering, proximal persistent, winged-petiolate, distally more widely winged or ± sessile, wings widening abruptly at strongly auriculate-clasping petiolar bases, blades ovate to lanceolate, 30–120 (–140) × (10–) 20–50 mm, reduced distally, bases cordate or auriculate-clasping (sessile), margins crenate-serrate or entire, apices acute or acuminate, mucronate;
    distal sessile, blades lanceovate to oblong or lanceolate to linear-lanceolate, sometimes pandurate (branch leaves ovate to lanceolate, sharply smaller), 4–100 × 0.5–26 mm, reduced distally, bases ± clasping, sheathing, margins serrulate or entire, apices acute or acuminate to long-acuminate.
    Heads in open, narrow to wide paniculiform arrays, branches widely spreading, divaricate to ascending, sometimes secund, ± densely leafy.
    Peduncles well developed, 0.3–3 (–5) cm, branches to 10 cm, spreading, bracteate, densely hirtellous to strigillose, bracts 3–10+, firm, appressed, subulate (2–3 mm), grading into phyllaries.
    Involucres campanulate to cylindro-campanulate, 3.8–5.5 mm.
    Phyllaries in 4–5 (–6) series, appressed or outer spreading, oblong-lanceolate (outer) to linear-oblanceolate (inner) or linear (innermost), strongly unequal, bases indurate 1/2–2/3, margins scarious, erose, hyaline, ciliolate, green zones diamond-shaped to lanceolate, apices acute to acuminate or obtuse, often ± involute, often mucronulate, sometimes tips purplish, abaxial faces hirsutulous, adaxial sparsely so distally.
    Ray-florets 12–16 (–25);
    corollas usually blue to purple, sometimes lilac, laminae 6–12 × 1.4–2.5 mm.
    Disc-florets 15–22 (–25);
    corollas cream or light yellow becoming purple, 4–5.8 mm, tubes slightly shorter than funnelform throats, lobes lanceolate, 0.5–0.9 mm.
    Cypselae dull purple to light-brown or tan, oblong-obovoid, compressed, 1.7–2.2 mm, 3–4-nerved, faces strigillose;
    pappi cream or rose-tinged, 3.5–5 mm. 2n = 16, 32.