Symphyotrichum ×amethystinum (Nuttall) G. L. Nesom (Q2504)
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Symphyotrichum ×amethystinum is a taxon with the rank species within the subgenus Symphyotrichum subg. Virgulus
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Symphyotrichum ×amethystinum (Nuttall) G. L. Nesom
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Symphyotrichum ×amethystinum is a taxon with the rank species within the subgenus Symphyotrichum subg. Virgulus
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Statements
taxon/id/Symphyotrichum ×amethystinum (Nuttall) G.L. Nesom
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Symphyotrichum ×amethystinum (Nuttall) G.L. Nesom
Symphyotrichum ×amethystinum
(Nuttall) 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-BC
present
introduced
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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-CO
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US-CT
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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-MN
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US-MO
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US-NE
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US-NJ
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US-NY
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US-ND
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US-PA
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US-RI
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US-VT
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US-WA
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US-WI
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200–400 m
200 meter
400 meter
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with thick, woody, short-branched caudices at ends of fleshy rhizomes.
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Stems 1–5+, erect (light-brown to grayish brown), densely hispidulo-hirsute.
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Leaves light green, thin to firm;
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basal withering by flowering, sessile, blades oblanceolate, 10–40 × 3–10 mm, attenuate, margins usually entire, rarely remotely serrate, piloso-ciliate, apices obtuse, rounded to mucronulate, faces sparsely to moderately strigose;
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proximal cauline sometimes persistent by flowering, sessile, blades linear or oblong to elliptic-oblanceolate, 40–60 × 3–10 mm, bases rounded or slightly clasping, margins entire, scabrous, apices acute to obtuse, faces ± copiously hirsute;
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distal sessile, blades oblanceolate, 15–45 × 2–3 (–4.5) mm, progressively reduced distally, bases cuneate, margins entire, apices acute, white-spine-tipped, faces sparsely strigose.
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Heads in ample, leafy, paniculiform arrays, branches ascending, sometimes secund (heads often crowded).
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Peduncles hispid, bracts 1–3+, oblong-lanceolate, 3–5 mm, not grading into phyllaries.
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Involucres campanulate to hemispheric, 4–6 mm.
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Phyllaries in 3–5 series, linear-lanceolate, ± unequal to subequal, bases ± indurate, margins hyaline proximally, outer distally hispido-scabrous, green zones diamond-shaped, restricted to distal 1/2–1/4, apices (outer) spreading to reflexed, acute, subspinulose, (inner) acuminate, purplish, faces (outer) scabroso-puberulent or strigose, eglandular, inner distally stipitate-glandular.
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Ray-florets 20–35;
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corollas azure blue to violet or lavender, laminae 5–10 × 0.6–1.2 mm.
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Disc-florets 20–30+;
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corollas light yellow turning pinkish to purple, 3–4 mm, tubes ca. 1/2 narrowly funnelform throats, lobes triangular, 0.5–0.7 mm, glabrous.
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Cypselae dull purple or brown, obovoid, not compressed, 1.5–2 mm, 7–9-nerved, faces densely sericeous;
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pappi tan to tawny, sometimes rose to violet-tinged, 3.5–5.5 mm. 2n = 10.
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strigose
sparsely to moderately
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strigose
sparsely to moderately
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elliptic-oblanceolate
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hirsute
more or less copiously
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reduced
progressively; distally
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light yellow turning pinkish to purple
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