(Elliott) G. L. Nesom, Phytologia. 77: 290. 1995.
Small white or smooth white oldfield aster
Elliott, Sketch Bot. S. Carolina 2: 348. 1823;
30—90(—100) cm, colonial or cespitose; long-rhizomatous or with woody caudices.
1—3+, erect (straight), glabrous or glabrate.
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.
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.
slender, 0.2—3+ cm or subsessile, hairy in lines, bracts 5—15, linear-elliptic to acicular, 1—2 mm, glabrous, grading into phyllaries.
cylindric, (2.5—)3.5—4.5(—5.5) mm.
in 4—6 series, appressed or outer ± spreading, oblong-lanceolate to linear (innermost) , unequal, bases indurate
/ 4 —
/ 2 , margins narrowly scarious, hyaline, ciliolate, green zones oblanceolate to linear-oblanceolate, apices acute to acuminate, mucronate, sometimes lightly purple-tinged, faces glabrous.
(12—)16—20; corollas usually white, rarely pink, laminae 5—8 × 0.5—1.2 mm.
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.
gray to tan, obovoid, ± compressed, 1—1.8 mm, 4—5-nerved (faint), faces sparsely strigillose or sericeus;
white, 2.5—3.5 mm.
Flowering Aug—Oct. Moist to wet, often alluvial soils, often brackish, marshes, savannas, bogs, wet meadows, prairie swales, swamps, borders of swamps, open bottomwoods; 0—200 m; 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.
is introduced in Canada. The species is cultivated commercially under the name
cv. 'Spray'. A. G. Jones (1989) reported hybridization with
S. dumosum, S. lateriflorum, S. lanceolatum
. The name
Lamarck has been misapplied to this taxon.