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
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Symphyotrichum prenanthoides (Muhlenberg ex Willdenow) G. L. Nesom
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Symphyotrichum prenanthoides is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum
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Statements
taxon/id/Symphyotrichum prenanthoides (Muhlenberg ex Willdenow) G.L. Nesom
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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
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CA-ON
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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.
CA-ON
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US-CT
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US-DE
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US-DC
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US-IL
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US-IN
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US-IA
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US-KY
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US-MD
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US-MA
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US-MI
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US-MN
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US-NJ
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US-NY
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US-NC
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US-OH
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US-PA
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US-VA
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US-WV
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US-WI
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100–1500 m
100 meter
1,500 meter
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Stems 1 (–3+), ascending to erect (usually flexuous, sometimes ± straight, sometimes stout, older often dark purple), glabrous proximally, moderately hirsute distally.
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Leaves thin, margins scabrous, apices mucronate, abaxial faces glabrous, midveins hispid to glabrate, adaxial scabrous;
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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;
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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;
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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.
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Heads in broad, ± flat, corymbo-paniculiform arrays, branches often purplish, divaricate to ascending, slender.
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Peduncles (8–) 10–40 mm, sparsely to densely hispid, bracts lanceolate to linear-lanceolate, 3–12 mm, somewhat grading into phyllaries.
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Involucres campanulate, 5–6 mm.
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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.
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Ray-florets 17–25 (–30);
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corollas usually lavender to blue, rarely white, laminae 7.5–12 (–15) × 1–2 mm.
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Disc-florets 39–50 (–65);
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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.
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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;
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pappi sordid, 3.5–4.5 mm. 2n = 32.
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hirsute
moderately; distally
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lanceovate or elliptic-lanceolate
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reduced
progressively; distally
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reduced
progressively; distally
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sparsely hirsutulous
glabrate or glabrous
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light yellow becoming purple or brown
becoming; becoming
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cylindro-oblanceoloid
obovoid
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strigillose
sparsely to moderately
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