Symphyotrichum dumosum (Linnaeus) G. L. Nesom (Q2420)
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Symphyotrichum dumosum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum
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Symphyotrichum dumosum (Linnaeus) G. L. Nesom
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Symphyotrichum dumosum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum
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Statements
taxon/id/Symphyotrichum dumosum (Linnaeus) G.L. Nesom
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Symphyotrichum dumosum (Linnaeus) G.L. Nesom
Symphyotrichum dumosum
(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
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CA-ON
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Newmaster, S.G. & S. Ragupathy. 2005. Flora Ontario - Integrated Botanical Information System (FOIBIS), Phase I. University of Guelph, Canada. http://www.uoguelph.ca/foibis http://www.uoguelph.ca/foibis/
CA-NB
present
introduced
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Hinds, H.R. 2000. Flora of New Brunswick : a manual for the identification of the vascular plants of New Brunswick. 2nd edition. Biology Department, University of New Brunswick, Fredericton. 699 pp.
CA-NB
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CA-ON
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US-AL
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US-AR
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US-CT
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US-DE
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US-DC
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US-FL
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US-GA
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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-LA
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US-ME
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US-MD
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US-MA
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US-MI
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US-MS
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US-MO
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US-NH
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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-OK
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US-PA
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US-RI
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US-SC
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US-TN
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US-TX
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US-VA
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usually long-rhizomatous, often thick, woody, sometimes short, or with short, stout caudices.
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Stems 1–5+, erect (straight, often slender, brittle), densely or sparsely strigose to glabrescent or glabrate.
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Leaves firm, margins entire to crenulate-serrate, recurved, scabrous, apices sharply white-mucronate, abaxial faces glabrous or glabrate to sparsely strigillose, adaxial glabrous or glabrate to submarginally scabrous (short-strigose), cauline withering by flowering (except on array branches), often with axillary leaf clusters;
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basal withering by flowering, petiolate, petioles winged, sheathing, strigose-ciliate, blades oblanceolate to spatulate (often declined), 8–50 × 3–15 mm, bases attenuate to cuneate, margins crenate-serrate, apices obtuse or rounded to ± acute;
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proximal cauline (mostly declined) subpetiolate (petioles widely winged, clasping) or sessile (then not or barely clasping), blades linear-oblanceolate, 25–120 × 1.5–9 mm, bases cuneate to slightly attenuate;
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distal (ascending or spreading) sessile, blades oblong or linear-lanceolate to linear, 2–45 × 0.5–4 mm, reduced distally (abruptly on branches), bases cuneate to rounded, not clasping, margins entire or serrate.
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Heads in remote, diffuse, open, paniculiform arrays, branches numerous, ascending to stiffly ascending, secondary ones stiff, racemiform (usually not secund).
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Peduncles slender, usually stiff (sometimes lax), (0.5–) 1–5 cm (rarely subsessile), progressively reduced distally, usually not secund, sparsely strigillose or glabrous, bracts 5–16+, spreading to ascending, linear-oblong or elliptic to subulate or linear, progressively reduced distally, grading into phyllaries.
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Involucres cylindro-campanulate, (3–) 4.5–6.3 mm.
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Phyllaries in 4–6 series, appressed or slightly spreading, oblong-oblanceolate (outer) to linear-oblanceolate or linear (innermost), strongly unequal, bases indurate (1/2–) 2/3–4/5, margins hyaline, scarious, erose, distally ciliolate, green zones oblanceolate to elliptic (subapical), apices acute to obtuse (scarious), sometimes faintly reddish, mucronulate, faces usually glabrous, sometimes glabrate.
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Ray-florets 15–33;
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corollas pale blue, pink, or lavender to white, laminae (4–) 5–7 (–8) × 1–1.7 mm.
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Disc-florets 15–30;
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corollas cream to pale-yellow turning pink, 3.5–4.5 mm, tubes shorter than to equal to narrowly funnelform throats, lobes lanceolate, (0.4–) 0.6–1.1 mm.
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Cypselae pink or stramineous with pink streaks, or gray (± dark, nerves stramineous), oblong-obovoid, sometimes ± compressed, 1.5–2.5 mm, 3–4-nerved (nerves prominent), faces strigillose;
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pappi white to sordid, 4 mm. 2n = 16, 32.
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strigose
glabrescent or glabrate
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glabrate
sparsely strigillose
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glabrate
submarginally scabrous
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reduced
progressively; distally
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compressed
sometimes more or less
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