Symphyotrichum pilosum

(Willdenow) G. L. Nesom

Phytologia 77: 289. 1995.

Common names: Oldfield or frost weed or white oldfield or hairy or hairy white oldfield aster aster poilu
Endemic
Basionym: Aster pilosus Willdenow Sp. Pl. 3: 2025. 1803
Synonyms: Aster ericoides var. pilosus (Willdenow) Porter
Treatment appears in FNA Volume 20. Treatment on page 511. Mentioned on page 467, 468, 495, 500, 512.

Perennials cespitose, (5–) 20–120 (–150+) cm; with stout, branched caudices, sometimes long-rhizomatous. Stems 1–5+, ascending to erect (straight, stout), glabrate to hirsuto-hispid or pilose, sometimes glabrous or hairy in lines (var. pringlei). Leaves thin, margins ciliate, apices acute to acuminate, mucronate, faces glabrous or ± hirsute (particularly on abaxial midveins); basal withering by flowering (new vernal rosettes developing at flowering), petiolate to subpetiolate (petioles winged, ciliate, bases sheathing), blades oblanceolate or obovate to spatulate, 10–60 × 5–15 mm, bases attenuate, margins sparsely crenate-serrate (mostly apically), apices obtuse to rounded; proximal cauline usually deciduous at flowering (often with axillary clusters of small leaves), petiolate or subpetiolate to subsessile (petioles narrowly to broadly winged, clasping), blades elliptic-oblanceolate or oblong to linear-lanceolate or oblanceolate, 40–102 × 5–25 mm, progressively reduced distally, bases attenuate to cuneate, ± clasping, margins entire to serrate, softly ciliate, apices attenuate, hyaline-spinulose; distal sessile, blades lance-oblong to linear-lanceolate to linear or linear-oblanceolate or linear-subulate, 10–100 × 1–8 mm, progressively reduced distally, branch leaves abruptly smaller, bases cuneate, margins entire or serrulate. Heads in open, leafy, often pyramidal, paniculiform arrays, branches divaricate or branches 10 cm or less ascending, often arched and secund, sometimes racemiform. Peduncles 5–30 (–50) mm, progressively shorter distally, glabrous or densely hispid, bracts 7–25+, appressed to ascending, sometimes ± spreading, linear to subulate, glabrate, ciliate or not, mucronate to apiculate, ± grading into phyllaries. Involucres campanulate to cylindro-campanulate, (2.5–) 3.5–5.1 (–6.5) mm. Phyllaries in 4–6 series, appressed or slightly spreading, oblong-lanceolate (outer) to linear (innermost), unequal (rarely subequal), bases indurate 1/2–3/5, margins hyaline, scarious, erose, ± ciliolate distally, green zones lanceolate to lance-rhombic, apices acute or acuminate, involute, spinulose, faces glabrous or sparsely hirsutulous. Ray-florets (10–) 16–28 (–38); corollas usually white, rarely pinkish or bluish, laminae (4–) 5.4–7.5 (–11) × (0.4–) 0.8–1.3 (–1.7) mm. Disc-florets (13–) 17–39 (–67); corollas light yellow becoming reddish purple or brown, (2.5–) 3–4.1 (–5.5) mm, tubes much shorter than narrowly funnelform throats, lobes lanceolate, (0.4–) 0.6–0.8 (–1) mm. Cypselae whitish or gray, oblong-obovoid, sometimes ± compressed, 1–1.5 × 0.5–0.7 mm, 4–6-nerved, faces sparsely strigillose; pappi white, 3.5–4 mm.

Distribution

V20-1141-distribution-map.gif

B.C., N.B., N.S., Ont., Que., Ala., Ark., Conn., D.C., Del., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., Maine, Mass., Md., Mich., Minn., Miss., Mo., N.C., N.H., N.J., N.Y., Nebr., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Va., Vt., W.Va., Wis.

Discussion

Varieties 2 (2 in the flora).

The ecology and cytogeography of Symphyotrichum pilosum were summarized by J. G. Chmielewski and J. C. Semple (2001b). The species is often confused with S. ericoides, which inhabits the same kinds of open, prairie-like habitats; the latter can be distinguished by its smaller heads and spine-tipped phyllary apices. Because of that, the name Aster ericoides has been misapplied often in floras and in the horticultural trade.

Selected References

None.

Key

1 Stems sparsely to densely hirsute; leaves pilose; various substrates Symphyotrichum pilosum var. pilosum
1 Stems glabrous; leaves glabrous or glabrate; mainly on calcareous substrates Symphyotrichum pilosum var. pringlei

"thin" is not a number.

... more about "Symphyotrichum pilosum"
not tailed +, rounded +  and obtuse +
petiolate +  and subpetiolate +
spinulose +, hyaline-spinulose +  and crenate-serrate +
distinct +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
subequal +
scarious +
5mm +  and 15mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, leafy +  and open +
indeterminate +  and determinate +
pyramidal +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Willdenow) G. L. Nesom +
petiolate +  and subpetiolate +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
cuneate +  and attenuate +
indurate +
5mm;15mm +
Aster pilosus +
subpetiolate +  and subsessile +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
lance-oblong;linear-lanceolate +
reduced +
1mm;8mm +
rugulose +  and muricate +
spreading +, appressed +  and ascending +
mucronate +  and apiculate +
racemiform +  and secund +
barbellulate +  and barbellate +
long-rhizomatous +  and branched +
sessile +  and petiolate +
Oldfield or frost weed or white oldfield or hairy or hairy white oldfield aster +  and aster poilu +
not 2-lipped +  and actinomorphic +
0.41 cm4.1 mm <br />0.0041 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
light yellow becoming reddish purple or brown +, bluish +, pinkish +  and white +
at maturity , more or less ampliate , tubes usually shorter +
0.3 cm3 mm <br />0.003 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
gray +  and whitish +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
strigillose +  and glabrous +
compressed +  and oblong-obovoid +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
B.C. +, N.B. +, N.S. +, Ont. +, Que. +, Ala. +, Ark. +, Conn. +, D.C. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Mass. +, Md. +, Mich. +, Minn. +, Miss. +, Mo. +, N.C. +, N.H. +, N.J. +, N.Y. +, Nebr. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Va. +, Vt. +, W.Va. +  and Wis. +
strigillose +, hirsutulous +, glabrous +  and hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.51 cm5.1 mm <br />0.0051 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
campanulate;cylindro-campanulate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.51 cm5.1 mm <br />0.0051 m <br />) +
0.75 cm7.5 mm <br />0.0075 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
5.4mm;7.5mm +
2 (?) +  and 5 (?) +
0.8mm;1.3mm +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
reflexed;spreading;erect +
lanceolate +
petiolate +  and subpetiolate +
serrulate +, entire +  and crenate-serrate +
10mm;60mm +
obtuse +  and rounded +
5mm +  and 15mm +
2-carpellate +
persistent +
25 +  and 40 +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
hispid +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
spreading +  and appressed +
oblong-lanceolate +  and linear +
4 cm40 mm <br />0.04 m <br /> (10.2 cm102 mm <br />0.102 m <br />) +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.1mm;0.2mm +
branched +  and simple +
ascending +  and erect +
1 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Aster ericoides var. pilosus +
Symphyotrichum pilosum +
Symphyotrichum sect. Symphyotrichum +
species +
funnelform-campanulate +  and cylindric +
ampliate +
120 cm1,200 mm <br />1.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
20 cm200 mm <br />0.2 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
tree +, shrub +  and subshrub +
lanceolate +  and lance-rhombic +