Symphyotrichum racemosum

(Elliott) G. L. Nesom

Phytologia 77: 290. 1995.

Common names: Small white or smooth white oldfield aster
Endemic
Basionym: Aster racemosus Elliott Sketch Bot. S. Carolina 2: 348. 1823
Synonyms: Aster brachypholis Small
Treatment appears in FNA Volume 20. Treatment on page 515. Mentioned on page 470, 495, 501, 514, 519, 521.

Perennials, 30–90 (–100) cm, colonial or cespitose; long-rhizomatous or with woody caudices. Stems 1–3+, erect (straight), glabrous or glabrate. Leaves thin, margins often ± revolute, scabrous, apices mucronate to mucronulate, faces glabrous or abaxial minutely pilosulous, cauline with clusters of smaller leaves in most axils; basal withering by flowering (new vernal rosettes often present), petiolate (petioles narrowly winged, sheathing, strigoso-ciliate), blades spatulate to oblanceolate, 5–40 × 5–15 mm, bases attenuate or cuneate to rounded, margins crenate-serrate, apices obtuse to acuminate; proximal cauline withering by flowering, petiolate or subpetiolate (proximalmost) or sessile (petioles winged, sparsely long strigoso-ciliate), blades elliptic or elliptic-lanceolate to lanceolate or linear-lanceolate, 20–70 × 3–20 mm, progressively reduced distally, bases clasping, margins becoming short-ciliate distally; distal (ascending or spreading) usually sessile, sometimes subpetiolate, blades linear-lanceolate to linear, 5–60+ × 1–8 mm, notably unequal in size, reduced distally, abruptly so on branches, bases cuneate to attenuate, margins serrulate or entire. Heads in diffuse, ± pyramidal, paniculiform arrays, branches ± lax, spreading horizontally or arching, racemiform, subtended by patent to reflexed branch leaves, often crowded but not (or barely) secund. Peduncles slender, 0.2–3+ cm or subsessile, hairy in lines, bracts 5–15, linear-elliptic to acicular, 1–2 mm, glabrous, grading into phyllaries. Involucres cylindric, (2.5–) 3.5–4.5 (–5.5) mm. Phyllaries in 4–6 series, appressed or outer ± spreading, oblong-lanceolate to linear (innermost), unequal, bases indurate 1/4–1/2, margins narrowly scarious, hyaline, ciliolate, green zones oblanceolate to linear-oblanceolate, apices acute to acuminate, mucronate, sometimes lightly purple-tinged, faces glabrous. Ray-florets (12–) 16–20; corollas usually white, rarely pink, laminae 5–8 × 0.5–1.2 mm. Disc-florets 10–20 (–25); corollas cream or pale-yellow becoming pink or red, (2.5–) 3–4.5 mm, tubes shorter than narrowly funnelform throats, lobes recurved to erect, lanceolate, 0.5–1 mm. Cypselae gray to tan, obovoid, ± compressed, 1–1.8 mm, 4–5-nerved (faint), faces sparsely strigillose or sericeus; pappi white, 2.5–3.5 mm. 2n = 16.


Phenology: Flowering Aug–Oct.
Habitat: Moist to wet, often alluvial soils, often brackish, marshes, savannas, bogs, wet meadows, prairie swales, swamps, borders of swamps, open bottomwoods
Elevation: 0–200 m

Distribution

V20-1148-distribution-map.gif

N.B., Ont., Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Ky., La., Maine, Md., Mass., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va.

Discussion

Symphyotrichum racemosum is introduced in Canada. The species is cultivated commercially under the name Aster ericoides cv. ‘Spray’. A. G. Jones (1989) reported hybridization with S. dumosum, S. lateriflorum, S. lanceolatum var. interior, and S. ontarionis. The name Aster vimineus Lamarck has been misapplied to this taxon.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Symphyotrichum racemosum"
not tailed +, rounded +  and obtuse +
purple-tinged +
distinct +
0.5 cm5 mm <br />0.005 m <br /> (4 cm40 mm <br />0.04 m <br />) +
subequal +
scarious +
5mm +  and 15mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
pyramidal +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Elliott) G. L. Nesom +
0.5 cm5 mm <br />0.005 m <br /> (4 cm40 mm <br />0.04 m <br />) +
cuneate +  and attenuate +
indurate +
5mm;15mm +
Aster racemosus +
sessile +, subpetiolate +  and petiolate +
0.5 cm5 mm <br />0.005 m <br /> (6 cm60 mm <br />0.06 m <br />) +
linear-lanceolate;linear +
reduced +  and unequal +
1mm;8mm +
rugulose +  and muricate +
linear-elliptic +  and acicular +
not secund +  and racemiform +
patent;reflexed +
arching;spreading +
barbellulate +  and barbellate +
sessile +  and petiolate +
Small white or smooth white oldfield aster +
not 2-lipped +  and actinomorphic +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
pale-yellow becoming pink or red +, cream +, pink +  and white +
at maturity , more or less ampliate , tubes usually shorter +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
gray +  and tan +
strigillose +  and glabrous +
compressed +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
subpetiolate +  and sessile +
N.B. +, Ont. +, Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Vt. +, Va. +  and W.Va. +
0–200 m +
sericeus +, strigillose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Moist to wet, often alluvial soils, often brackish, marshes, savannas, bogs, wet meadows, prairie swales, swamps, borders of swamps, open bottomwoods +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
2 (?) +  and 5 (?) +
0.5mm;1.2mm +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
recurved;erect +
lanceolate +
entire +, serrulate +  and crenate-serrate +
obtuse +  and acuminate +
5mm +  and 15mm +
2-carpellate +
persistent +
25 +  and 40 +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Aug–Oct. +
oblanceolate or spatulate +  and linear +
strongly unequal +  and subequal +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 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 +
1 +  and 3 +
appendaged +  and truncate +
papillate +  and smooth +
Aster brachypholis +
Symphyotrichum racemosum +
Symphyotrichum sect. Symphyotrichum +
species +
funnelform-campanulate +  and cylindric +
ampliate +
with woody caudices +  and long-rhizomatous +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
cespitose +  and colonial +
30 cm300 mm <br />0.3 m <br /> (90 cm900 mm <br />0.9 m <br />) +
tree +, shrub +  and subshrub +
oblanceolate +  and linear-oblanceolate +