Symphyotrichum tenuifolium

(Linnaeus) G. L. Nesom

Phytologia 77: 293. 1995.

Common names: Perennial saltmarsh aster
Basionym: Aster tenuifolius Linnaeus Sp. Pl. 2: 873. 1753
Treatment appears in FNA Volume 20. Treatment on page 479. Mentioned on page 468, 473.

Perennials, (20–) 40–60 (–100) cm, colonial or cespitose; rhizomatous. Stems 1–5+, ascending to erect (often with purple or purplish brown areas, flexuous, wiry), little-branched, usually glabrous, sometimes hairy in lines distally. Leaves thick (fleshy), margins entire, faces glabrous; basal withering by flowering (new winter rosettes appearing at flowering), petiolate (petioles sheathing), blades ovate or oblanceolate, 15–20 × 5–15 mm, bases cuneate, apices rounded; proximal cauline withering by flowering, usually sessile, blades lanceolate, linear-lanceolate or oblanceolate, to linear, 7–80 (–150) × 1–6 (–12) mm, bases attenuate, margins entire, apices acuminate to acute; distal sessile, blades narrowly lanceolate to subulate, 10–110 × 0.5–5 mm, apices acuminate. Heads (1–) 3–20 (–40), in open, diffuse, paniculiform arrays, branches patent. Peduncles 0.6–4 (–6) cm, bracts 2–8, awl-shaped, grading into phyllaries. Involucres narrowly turbinate, 4.1–9.5 (–11) mm. Phyllaries in 4–5 series, lanceolate to subulate, bases indurate, rounded, margins hyaline, often tinged with purple, entire, green zones spatulate to oblanceolate-rhombic, apices acute, adaxial faces glabrous or minutely hairy distally. Ray-florets 10–25; corollas white or pink, laminae (4.5–) 5–8.5 (–9.5) × 1.2–2 mm. Disc-florets 25–45 (–54); corollas yellow becoming purplish, 3.4–6 (–6.8) mm, tubes shorter than to equaling the narrowly funnelform throats (sparsely hairy at base), lobes ± erect, narrowly triangular, 0.5–0.8 mm. Cypselae light-brown, narrowly obovoid to fusiform, sometimes ± compressed, 1.5–4 (–4.5) mm, 5–6-nerved, faces sparsely strigillose; pappi tawny to white, 3–6.1 mm.

Distribution

V20-1077-distribution-map.gif

Ala., Conn., Del., Fla., Ga., La., Maine, Mass., Md., Miss., N.C., N.H., N.J., N.Y., R.I., S.C., Tex., Va., West Indies

Discussion

Varieties 2 (2 in the flora).

Along the Gulf of Mexico Coast in central and northern peninsular Florida, vars. tenuifolium and aphyllum intergrade in nearly all characters (S. D. Sundberg 2004). G. L. Nesom (2005d) treated the varieties as species.

Selected References

None.

Key

1 Stems 1, rhizomes long; mid leaves (1.5–)3–6 mm wide; involucres 6–9.5(–11) mm; ray florets (12–)17–25; disc florets 25–45(–54), corollas (4–)4.7–6(–6.5) mm; cypselae 2.8–4(–4.5) mm; pappi 5–6.1 mm Symphyotrichum tenuifolium var. tenuifolium
1 Stems 1–5+ (clustered), rhizomes short; mid leaves (1–)1.5–2.7 mm wide; involucres 4.1–5.3 mm; ray florets 10–16; disc florets (10–)13–23, corollas 3.4–4.6 mm; cypselae 1.5–2(–2.5) mm; pappi 3–4.4 mm Symphyotrichum tenuifolium var. aphyllum

"thick" is not a number.

hairy +  and glabrous +
not tailed +, rounded +  and obtuse +
sessile +  and petiolate +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
distinct +
0.7 cm7 mm <br />0.007 m <br /> (8 cm80 mm <br />0.08 m <br />) +
subequal +
scarious +
1mm +  and 6mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Linnaeus) G. L. Nesom +
sessile +  and petiolate +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (8 cm80 mm <br />0.08 m <br />) +
rounded +, acuminate +  and acute +
indurate +
1mm;6mm +
Aster tenuifolius +
sessile +  and petiolate +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 cm10 mm <br />0.01 m <br /> (11 cm110 mm <br />0.11 m <br />) +
narrowly lanceolate;subulate +
0.5mm;5mm +
rugulose +  and muricate +
awl--shaped +
barbellulate +  and barbellate +
sessile +  and subpetiolate +
Perennial saltmarsh aster +
not 2-lipped +  and actinomorphic +
0.6 cm6 mm <br />0.006 m <br /> (0.68 cm6.8 mm <br />0.0068 m <br />) +
yellow becoming purplish +, pink +  and white +
at maturity , more or less ampliate , tubes usually shorter +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
glabrate +  and strigillose +
compressed +, narrowly obovoid +  and fusiform +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Conn. +, Del. +, Fla. +, Ga. +, La. +, Maine +, Mass. +, Md. +, Miss. +, N.C. +, N.H. +, N.J. +, N.Y. +, R.I. +, S.C. +, Tex. +, Va. +  and West Indies +
strigillose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.95 cm9.5 mm <br />0.0095 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.41 cm4.1 mm <br />0.0041 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
0.85 cm8.5 mm <br />0.0085 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
5mm;8.5mm +
1.2mm;2mm +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
triangular +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
tinged with purple +  and hyaline +
ciliate +  and scabrous +
acuminate +  and acute +
1mm +  and 6mm +
2-carpellate +
tawny +  and white +
persistent +
25 +  and 40 +
0.3 cm3 mm <br />0.003 m <br /> (0.61 cm6.1 mm <br />0.0061 m <br />) +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (4 cm40 mm <br />0.04 m <br />) +
lanceolate +  and subulate +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
little-branched +
not brittle +
ascending +  and erect +
1 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Aster sect. Hesterastrum +, Aster sect. Oxytripolium +, Undefined subg. Conyzanthus +, Symphyotrichum sect. Oxytripolium +  and Tripolium sect. Oxytripolium +
Symphyotrichum tenuifolium +
Symphyotrichum subg. Astropolium +
species +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
60 cm600 mm <br />0.6 m <br /> (100 cm1,000 mm <br />1 m <br />) +
cespitose +  and colonial +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
tree +, shrub +  and subshrub +
spatulate +  and oblanceolate-rhombic +