Eurybia spectabilis
Eurybia sibirica
eastern showy aster, purple wood-aster, western showy aster
arctic aster, Siberian aster, Siberian wood-aster
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.
1–5+, usually ascending, sometimes decumbent, often purplish, sometimes branched basally, flexuous, proximally sparsely villous, distally usually densely villous, sometimes lanate.
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.
cauline (dark green abaxially, paler grayish green adaxially), firm, ± markedly veined, margins coarsely and sometimes irregularly serrate, sometimes (distal) serrulate or entire, villoso-ciliate, teeth mucronate, slightly incurved, apices obtuse to acute, mucronate, abaxial faces glabrescent to scabridulous, sparsely villous along veins, adaxial sparsely to ± densely villous or villoso-strigose;
proximal winged-petiolate to sessile, petiole bases sheathing, blades spatulate, obovate to oblanceolate, or ovate (smaller than mid), 9–50 × 3–22 mm, bases attenuate to tapering and (in sessile) subclasping;
mid short-petiolate to subpetiolate or sessile, blades lanceolate to lance-ovate, oblong to oblanceolate, or obovate to spatulate, 25–95 × 6–35 mm, gradually reduced distally, bases rounded or subauriculate to widely attenuate or cuneate;
distal (arrays) sessile, lanceolate, lance-ovate, or elliptic to oblanceolate, 8–60 × 1–12 mm, rapidly reduced distally.
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.
villous;
bracts 0–3, sometimes immediately subtending heads, lanceolate or spatulate to linear-lanceolate, leaflike or phyllary-like distally (bases indurate, margins purplish), mostly foliaceous, villous.
campanulate, 7.5–14(–16) mm, ± equaling pappi.
campanulate, 6–9 mm, shorter than pappi.
15–35;
corollas violet-purple, 12–25 × 1.6–4 mm.
12–50;
corollas white to pale violet or purple, 7–17.5 × 0.8–1.8 mm.
25–55;
corollas yellow, 5.5–7.6 mm, ± ampliate, tubes shorter than funnelform throats, lobes erect, lanceolate, 0.7–1.2 mm.
25–125;
corollas yellow becoming purplish, 5–8.1 mm, slightly ampliate, tubes longer than funnelform throats, lobes erect, triangular, 0.5–1.1 mm.
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).
30–80 in 3–4(–5) series, sometimes wholly purplish, usually ± oblong-lanceolate to oblanceolate, sometimes linear-lanceolate (innermost), subequal or ± unequal, membranous, bases indurate, ± rounded, dark green zones lanceolate or truncate at base, in distal 1/3–4/5+ (outer, often foliaceous, sometimes bractlike and surpassing involucres) to 1/4–2/3 (inner), margins hyaline, often purplish, narrowly scarious, erose, densely villoso-ciliate, apices squarrose, acute, apiculate, faces villous.
(1–)3–35+ usually in open, corymbiform arrays, seldom borne singly, branches ascending, stout.
1–50, borne singly or in open corymbiform arrays.
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.
brown, fusiform, compressed, 2.5–3.7 mm, ribs 7–10 (stramineous), faces strigillose;
pappi of dark cinnamon or reddish tan (sometimes apically clavellate) bristles 5.5–7.5 mm, ± equaling disc corollas.
= 72.
= 18.
Eurybia spectabilis
Eurybia sibirica
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.)
Eurybia sibirica is known from the northern Rocky Mountains and the northern Pacific Coast northward, becoming frequent in Alaska, Yukon, and in the boreal forest region of the continental Northwest Territories; it crosses into Siberia to reach Scandinavia (R. Elven 1989). In British Columbia, northern individuals belong to E. sibirica, not E. pygmaea (contra G. W. Douglas et al. 1998–2002, vol. 1), and southern specimens sometimes are E. merita. G. L. Nesom (1994b) recognized three varieties, two of which have been reported from North America (var. sibirica and var. gigantea). At present, however, given the great phenotypic plasticity of this species, it appears preferable not to recognize varieties, pending studies on the validity of these entities. Eurybia sibirica has often been confused at its southern range limit with E. merita, from which it differs by its often more low-cespitose habit (versus more erect habit, but smaller individuals may be similar in this respect), usually more serrate leaves (versus subserrate to nearly entire), and subequal, foliaceous, purplish phyllaries (versus unequal, non-foliaceous, purple-margined). At the southern end of its range, near the Canada–United States border, E. sibirica is usually found at higher elevations than its congener, there at its northern limit. Aster sibiricus forma albinus Lepage is merely a color variant of the species and is not recognized here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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