Plants (20-)40-110 cm, in ± dense clones (with sterile rosettes on short rhizomeds); rhizomes branched, long. Stems 1, erect, simple, straight, proximally glabrous or sparsely villous, distally densely villous. Leaves basal and cauline, margins coarsely serrate (proximal) to serrate (distal), strigoso-ciliate, teeth (15-30 per side) mucronulate, apices acuminate, abaxial faces sparsely strigose, long-stipitate-glandular on veins, adaxial sparsely villous, more densely so on veins; basal withering by flowering, petiolate (55-180 mm), bases sheathing, blades broadly ovate, 55-110 × 48-95 mm, bases cordate (with mostly deep, rectangular sinuses); cauline petiolate to (distal) subsessile, petioles (4-100 mm) ± winged, ± clasping, blades ovate to broadly lanceolate, 27-135 × 7-112 mm, bases cordate (sinuses narrower) to rounded or cuneate-rounded; distal (arrays) sessile, ovate to lanceolate, 6-70 × 1-27 mm. Heads 15-100+ in flat-topped, corymbiform arrays. Peduncles sparsely to moderately villous, sparsely glandular; bracts 0-1, linear. Involucres cylindro-campanulate, 5.5-7.5 mm, equal to or shorter than pappi. Phyllaries 23-32 in 4-5 series, oblong (outer) to lanceolate (inner), strongly unequal, bases indurate, dark green zones in distal ¹ / 4 or less (outer), often confined to narrow strip along midnerves or none (inner), margins narrowly scarious, densely villoso-ciliate, apices ± loose, obtuse to rounded, faces glabrous or sparsely villosulous, sometimes sparsely stipitate-glandular. Ray florets 6-12; corollas white, 10.5-13 × 1.5-2.1 mm. Disc florets 12-20(-30); corollas yellow, 5-6.8 mm, slightly ampliate, tubes (3.2-3.8 mm) longer than campanulate throats (1.1-1.9 mm), lobes erect to slightly spreading, lanceolate, (0.9-)1.1-1.5(-1.9) mm. Cypselae brown, fusiform to cylindro-obconic, compressed, 3.2-3.7 mm, ribs 6-12, faces glabrous or sparsely strigillose; pappi of (65-70) orangish to burnt orange (fine, barbellulate, sometimes apically clavellate) bristles 5-6.8 mm, ± equaling disc corolla. 2n = 54.

Flowering late summer-early fall. Damp to mesic deciduous (maple, elm, oak), mixed woods, thickets, shaded roadbanks; 0-1200 m; Ont.; Conn., Del., Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., N.H., N.J., N.Y., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.; introduced in Europe (Scotland).

Eurybia schreberi is rare or extirpated in a many states at the northern limit of its range.

Similar to no. 41 [Aster macrophyllus L.]but eglandular, with merely puberulent infl and normally with white rays; basal lvs tending to have a rectangular sinus; invol 5-10 mm, often very narrow, its bracts avg narrower than in no. 41 and sometimes a little loose, those of the inner row much the longest; rays 6-14; 2n=54. Woods; N.H. and se. Me. to Del. and Va., w. to O. and W.Va., and irregularly to Tenn., Ala., Ill., and e. Wis. (A. chasei; A. curvescens; A. glomeratus) The midwestern plants (A. chasei G. N. Jones) may be alloploidsof nos. 41 and 44 [Aster furcatus Burgess], whereas the more eastern ones (A. schreberi proper) may be alloploids of nos. 41 [Aster macrophyllus L.] and 43 [Aster divaricatus L.]

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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