Symphyotrichum praealtum (Poiret) G. L. Nesom (Q2453)

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

    Statements

    taxon/id/Symphyotrichum praealtum (Poiret) G.L. Nesom
    0 references
    Symphyotrichum praealtum (Poiret) G.L. Nesom
    Symphyotrichum praealtum
    (Poiret) 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 praealtum
    willow-leaved aster (English)
    willow aster (English)
    veiny-lined aster (English)
    aster très élevé (French)
    Willowleaf or willow aster (English)
    Flowering Aug–Oct.
    loamy soils
    wet prairies
    meadows
    stream shores
    oak savannas
    open woods
    thickets
    fields
    moist banks
    ditches
    roadsides
    recent clearings
    Mexico (Chihuahua)
    Mexico (Coahuila)
    Mexico (Nuevo Léon)
    in Europe
    Stems 1, erect to ascending (stout, ± glaucous or reddish), glabrate to moderately hispidulous-hirsute (mostly in lines) distally.
    Leaves thick, firm, margins often revolute, scabrous, apices mucronate, abaxial faces glabrous, vein areoles conspicuous, ± isodiametric, adaxial waxy, glabrate to strigose, ± scabrous (distal cauline with axillary leaf clusters, sometimes becoming branches);
    basal withering by flowering, petiolate to subpetiolate (petioles winged, bases sheathing, ciliate), blades spatulate, 40–70 × 10–25 mm, bases attenuate, margins entire to shallowly serrate, apices rounded to obtuse;
    proximal cauline withering by flowering, sessile (subpetiolate), blades elliptic or lanceolate to oblanceolate or linear-lanceolate, 40–100 (–150) × 3–18 mm, progressively reduced distally, bases cuneate, often slightly rounded, apices acute to attenuate, callus-pointed, abaxial faces scabrellous, adaxial glabrous or ± puberulent;
    distal sessile, blades ovate or elliptic-lanceolate to lanceolate or linear, 10–85 × 2–17 mm, progressively reduced distally, bases cuneate, margins entire, apices acute or obtuse, callus-pointed.
    Heads in ample, foliaceous, usually dense, paniculiform arrays, branches ascending to spreading, ± racemiform.
    Peduncles 0.3–2 cm, ± pilose, bracts 5–12+, ascending or recurved-spreading, lance-elliptic to lanceolate or linear-lanceolate, foliaceous, distal closely subtending heads, not grading into phyllaries.
    Involucres campanulate, (4–) 5–7 (–8) mm.
    Phyllaries in 4–6 series, appressed, oblong-lanceolate to linear (innermost) (outer sometimes ± foliaceous), unequal, bases indurate 1/2–3/4, margins scarious, erose, hyaline, sparsely ciliolate (often ciliate basally), green zones lanceolate to lance-rhombic, apices sometimes spreading, acute to acuminate, mucronate, often reddish purple apically, faces glabrous.
    Ray-florets (6–) 20–35;
    corollas pale blue-violet to lavender or rose-purple, rarely white, laminae 5–10 (–12) × 1–1.7 mm.
    Disc-florets 20–30 (–35+);
    corollas cream or light yellow turning pinkish purple, 4–6.5 mm, tubes shorter than narrowly funnelform throats, lobes lanceolate, 0.5–1.3 mm.
    Cypselae purple or stramineous with purple, obovoid, sometimes ± compressed, 1.5–2 mm, 4–5-nerved, faces thinly strigillose;
    pappi white, 4–6.5 mm. 2n = 32, 48, 64.