Eurybia divaricata
Eurybia spectabilis
aster à rameaux étalés, white wood-aster
eastern showy aster, purple wood-aster, western showy aster
1, erect, simple, flexuous, glabrate to sparsely puberulent proximally, densely puberulent distally.
1–3, erect or sometimes ascending, straight, often stout, sometimes glabrous or glabrescent, usually ± sparsely villous proximally and/or distally, proximally eglandular to ± short-stipitate-glandular, distally glandular from 1/2–2/3, short- and long-stipitate-glandular in arrays.
basal and cauline, thin, margins sharply serrate, teeth (6–15 per side) mucronulate, ciliate, apices acuminate, abaxial faces sparsely strigose or villous, particularly villous along veins, adaxial glabrescent to sparsely strigose, veins sparsely stipitate-glandular;
basal and proximal withering by flowering, petiolate (petioles 20–70 mm), blades ovate, 19–65 × 17–60 mm, basal smaller than proximal, bases cordate (sinuses narrow, curved);
cauline petiolate, petioles often ± winged (15–70 mm), blades ovate, 20–200 × 10–100 mm, bases cordate to rounded;
distal (arrays) usually sessile, sometimes subpetiolate, blades ovate to lanceolate, 5–20 × 1–8 mm, bases rounded.
basal and cauline, firm (reticulately veined), margins slightly revolute, indurate, entire or remotely crenulate-serrulate, scabrous, teeth indurate, apices acute (seldom basal obtuse), indurate, faces usually scabrous (especially abaxially), sometimes glabrous;
basal and proximal cauline persistent, petioles (10–90 mm) ± narrowly winged (wings wider and shorter distally), bases sometimes marcescent, blades lanceolate or elliptic to ovate- or obovate-elliptic or spatulate, 10–160 × 3–40 mm (earlier leaves smallest), bases attenuate;
mid widely winged-petiolate to subpetiolate or sessile, blades elliptic-lanceolate, ovate, or ± narrowly obovate to spatulate, oblanceolate, or lanceolate, 13–105 × (2–)5–30 mm, ± gradually reduced distally, bases attenuate or cuneate, sometimes ± clasping or sheathing (proximal);
distal (arrays) sessile, oblong or narrowly ovate to linear-lanceolate or linear, 6–40 × 1–11 mm, usually abruptly reduced, becoming ± glandular.
to 1.5 cm, densely hairy, eglandular;
bracts 0(–2).
sometimes sparsely villous, densely stipitate-glandular;
bracts (0–)1–3, leaflike or sometimes phyllary-like (bases rounded, membranous, indurate), sometimes immediately subtending heads, densely stipitate-glandular.
cylindro-campanulate, 4.2–6 mm, much shorter than pappi.
campanulate, 7.5–14(–16) mm, ± equaling pappi.
5–10(–12);
corollas white, 6–12 × 1.5–2.2 mm.
15–35;
corollas violet-purple, 12–25 × 1.6–4 mm.
12–19(–25);
corollas yellow, 4.1–4.8(–5.5) mm, abruptly ampliate, tubes (2.3–2.6 mm) longer than campanulate throats (0.9–1.2 mm), lobes reflexed, lanceolate, 0.7–1.4 mm.
25–55;
corollas yellow, 5.5–7.6 mm, ± ampliate, tubes shorter than funnelform throats, lobes erect, lanceolate, 0.7–1.2 mm.
25–30 in 4–5 series, inner purplish distally, oblong (outer) to lanceolate or linear-lanceolate (inner), strongly unequal, bases indurate, green zones in distal 1/2 (outer) to 1/3 or along distal midveins (inner), margins narrowly scarious, densely fimbriate-ciliate, apices rounded to acute, faces sparsely hairy, sometimes sparsely stipitate-glandular;
outer 0.7–1.5 mm wide, lengths seldom more than 2.5 times widths.
35–70 in 5–6 series, oblong-lanceolate to sometimes spatulate (outer) to linear-lanceolate or linear (inner), unequal, membranous or sometimes foliaceous (outer), bases indurate, rounded (outer), green zones expanded, ovate to obovate (outer, sometimes foliaceous to base) or diffusely lanceolate or none (inner), margins of membranous parts hyaline or ± purplish (inner), narrowly scarious, villoso-ciliate or long-stipitate-glandular, of foliaceous parts ± indurate, scabrous or short-stipitate-glandular, apices squarrose (outer) to ± appressed (innermost), acute to obtuse, adaxial faces long-stipitate-glandular (foliaceous parts).
4–50(–100+) in ± flat-topped corymbiform arrays.
(1–)3–35+ usually in open, corymbiform arrays, seldom borne singly, branches ascending, stout.
brown, cylindro-obovoid, slightly compressed, 2.6–3.8 mm, ribs 7–10 (tan to stramineous), faces sparsely strigillose;
pappi of reddish to cream-colored (fine, barbellulate, sometimes apically ± clavate) bristles 3.7–5 mm, equaling or longer than disc corollas.
brown, fusiform, slightly compressed, 3–4.2 mm, ribs 12–14, faces densely strigillose;
pappi of reddish-tawnish bristles 5.3–7.6 mm, ± equaling disc corollas.
= 18.
= 72.
Eurybia divaricata
Eurybia spectabilis
Eurybia divaricata is a mainly Appalachian element of the eastern North American deciduous forest. It is often confused with Eurybia chlorolepis (see W. F. Lamboy 1992 for distinction between the two species), E. schreberi, or Symphyotrichum cordifolium. Lamboy provided a map of the species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Eurybia spectabilis is of conservation concern in much of its range, notably in Pennsylvania, Delaware, and Maryland. It is an eastern coastal plains species that reaches its southern limit in Alabama and Georgia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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