Symphyotrichum undulatum (Linnaeus) G. L. Nesom (Q2428)
Symphyotrichum undulatum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum
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Symphyotrichum undulatum (Linnaeus) G. L. Nesom
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Symphyotrichum undulatum is a taxon with the rank species within the section Symphyotrichum sect. Symphyotrichum
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Statements
taxon/id/Symphyotrichum undulatum (Linnaeus) G.L. Nesom
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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
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CA-ON
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Morton, J.K., & J.M. Venn. 1990. A checklist of the flora of Ontario: vascular plants. University of Waterloo Biology series 34. 218 pp.
CA-NS
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Zinck, M. 1998. Roland's Flora of Nova Scotia. Nimber Publishing & Nova Scotia Museum. Halifax, N. S. 2 vols. 1297 pp.
CA-NS
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CA-ON
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US-AL
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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-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-MS
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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-PA
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US-RI
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US-SC
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200–1500 m
200 meter
1,500 meter
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short-rhizomatous or with branched, woody caudices.
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Stems 1–3+, erect (straight, brittle), hirtellous to glabrescent proximally to densely hirtellous distally.
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Leaves thin, margins scabrous, abaxial faces hirtellous, densely so on midveins, adaxial usually scabrous, sometimes strigose or hirsute, rarely glabrate;
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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;
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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;
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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.
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Heads in open, narrow to wide paniculiform arrays, branches widely spreading, divaricate to ascending, sometimes secund, ± densely leafy.
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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.
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Involucres campanulate to cylindro-campanulate, 3.8–5.5 mm.
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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.
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Ray-florets 12–16 (–25);
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corollas usually blue to purple, sometimes lilac, laminae 6–12 × 1.4–2.5 mm.
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Disc-florets 15–22 (–25);
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corollas cream or light yellow becoming purple, 4–5.8 mm, tubes slightly shorter than funnelform throats, lobes lanceolate, 0.5–0.9 mm.
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Cypselae dull purple to light-brown or tan, oblong-obovoid, compressed, 1.7–2.2 mm, 3–4-nerved, faces strigillose;
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pappi cream or rose-tinged, 3.5–5 mm. 2n = 16, 32.
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shallowly crenate-serrate
subentire
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shallowly crenate-serrate
subentire
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shallowly crenate-serrate
subentire
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lanceovate
oblong or lanceolate
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campanulate
cylindro-campanulate
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light yellow becoming purple
becoming
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