Eurybia hemispherica
Eurybia macrophylla
single-stem bog or southern prairie aster, southern prairie aster
aster à grandes feuilles, bigleaf aster, large-leaf wood-aster
1–4, erect or ascending, often reddish, simple, straight to stict, proximally glabrous, distally ± sparsely strigillose (at least arrays).
1, erect, simple, straight to ± flexuous, glabrous or sparsely villous, stipitate-glandular, more densely so distally (at least in arrays).
basal and cauline, blades with adaxial midvnerves raised (grooved abaxially), sometimes with 1–2 ± parallel pairs of more obscure secondary nerves (veins obscure), lance-ovate or linear-lanceolate to linear, coriaceous, margins usually entire, sometimes remotely spinulose-toothed, often revolute apically, indurate, scabrous, apices acute, acuminate or obtuse, indurate, abaxial faces glabrous or glabrate, adaxial sparsely scabridulous (hairs minuscule, basal “bulb” bearing terminal seta);
basal withering by flowering, petioles marcescent, ± winged;
proximal petiole bases sheathing, blades 50–175 × 3–12 mm, bases attenuate or cuneate;
cauline progressively sessile and reduced distally, 25–125(–150) × 1.5–8 mm, bases clasping to subclasping.
basal and cauline, thick, firm, margins coarsely serrate (proximal) to crenate-serrate or entire (distal), scabrous, teeth mucronate, apices acuminate, sharply mucronate, abaxial faces glabrescent to sparsely strigose, veins stipitate-glandular, adaxial sparsely strigose, ± densely villous on veins, short-stipitate-glandular (more so on distal);
basal withering by flowering, petioles (25–)80–170 mm, ± winged, bases sheathing, ciliate, blades broadly ovate, (45–)110–250 × (25–)55–150 mm, bases deeply cordate (sinuses curved), sometimes slightly oblique;
cauline petiolate (3–110 mm), gradually more broadly winged and sometimes ± auriculate distally, ± clasping, ciliate, to subpetiolate or sessile, blades broadly ovate to ovate, 22–104 × 9–80 mm, gradually reduced distally, bases cordate to rounded or attenuate to cuneate;
distal (arrays) sessile, blades ovate or broadly lanceolate or elliptic to obovate or oblanceolate, 9–38 × 3–13 mm, abruptly reduced distally, bases ± clasping to rounded or cuneate (arrays), margins crenate-serrate or entire.
2–80 mm or subsessile;
bracts 0–4, linear-lanceolate, 10–35 × 0.5–2 mm, mucronulate, grading into phyllaries.
firm, 0–4 cm, densely stipitate-glandular;
bracts 0–2, ovate-lanceolate, ± stipitate-glandular.
hemispheric, 8–12(–15) mm, shorter than pappi.
broadly campanulate to campanulate, (6–)7–11 mm, shorter than pappi.
15–30;
corollas usually violet-purple, seldom white, (10–)13–15(–20) × 1.3–3 mm.
9–20;
corollas ± deep lavender or violet to occasionally white, (7–)11–15 × 1.4–2.4 mm.
(40–)52–80+;
corollas light yellow turning brown, 5.8–6.6 mm, ± ampliate, tubes (1.7–2.2 mm) shorter than narrowly campanulate throats (3.4–4 mm), lobes erect, lanceolate and cuspidate or acuminate, 0.7–1.2 mm.
20–40;
corollas cream-color or light yellow, becoming purple, 6–7.5 mm, slightly ampliate, tubes (ca. 4 mm) longer than funnelform throats (ca 1.2 mm), lobes reflexed, lanceolate, 1–1.6 mm.
48–64 in 4–6 series, oblong-lanceolate or lanceolate (outer) to oblong or lanceolate-linear (inner), unequal, coriaceous (outer) to membranous (inner), bases indurate, rounded (outer), green zones slightly expanded, in 1/2–4/5 distal portions (outer), margins indurate, scabrous or scabroso-ciliate, edges and apices purplish in inner, apices ascending or squarrose to strongly reflexed, acute to acuminate, mucronulate, faces glabrous.
32–35 in 5–6 series, appressed, often purple-tinged, usually obovate to oblong, seldom ovate (outer) to oblanceolate or linear-lanceolate (inner) (innermost to 7 mm), strongly unequal, bases indurate, keeled or rounded adaxially, dark green zones wide, 1/3–1/2 distal portion (rarely to base in outer) to less pronounced along midveins or none (inner), margins hyaline or reddish, scarious, ± erose, densely villoso-ciliate apically, apices obtuse to rounded or acute (inner), adaxial faces ± villous, ± stipitate-glandular.
1–35+ in elongate, usually racemiform to spiciform, sometimes ± flat-topped, corymbiform arrays, branches robust, ascending.
(2–)8–90+ in flat-topped, corymbiform arrays.
brown, cylindro-obovoid to fusiform, slightly flattened, 2.6–3.7 mm, ribs 9–16 (stramineous to olive, crowded), faces ± densely strigillose;
pappi of tawny to cinnamom (coarse, rigid, sometimes apically clavellate) bristles 6–7.5 mm, equaling disc corollas.
brown, fusiform or cylindro-obconic, compressed, 2.6–4.5 mm, ribs 7–12 (golden brown), faces glabrous or sparsely strigillose distally;
pappi of tawny to orangish (sometimes clavellate) bristles 5–7.5 mm, slightly longer than disc corollas.
= 18, 36.
= 72.
Eurybia hemispherica
Eurybia macrophylla
Eurybia hemispherica is of conservation concern in Florida, Georgia, and Kentucky. A. Cronquist (1980) stated that this species and E. paludosa are difficult to separate but geographically distinct (see under 21. E. paludosa). The two species are often treated as infraspecific taxa of E. paludosa. Eurybia hemispherica is diploid and tetraploid, while E. paludosa has been reported only as a tetraploid. There is great morphologic variation in E. hemispherica, from slender individuals, reminiscent of E. paludosa, to very robust, distinctive plants. Arrays in E. hemispherica are usually racemiform; well-developed ones may be distally corymbiform and resemble the arrays of E. paludosa, although the proximal part remains somewhat racemiform (i.e., proximal heads borne on short, simple branches, or tufts of leaves are present). Phyllaries in E. hemispherica may be superficially similar to those of E. paludosa, but often the outer phyllaries are similar to peduncular bracts (and in fact may have been recruited from such), being more triangular, coriaceous, and parallel-veined, a feature never encoutered in E. paludosa; such phyllaries strongly resemble those of E. eryngiifolia. Other characters may help distinguish the two species. Eurybia paludosa usually has thin peduncles, hirtello-puberulent to villoso-hirsute peduncles and phyllaries, and ciliate phyllary margins along the indurate bases. In E. hemispherica, the pedicels are thin to usually robust, when present, the phyllaries are glabrous to sparsely strigillose, and the phyllary margins along the indurate bases are scabrous or scabroso-ciliate, not long-ciliate.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Eurybia macrophylla, a species of the northeastern deciduous or mixed forest, extends north into the southern boreal forest of Ontario-Quebec, and south along the Blue Ridges into northern Georgia. It becomes rare at the western edge of its range (Manitoba, Illinois, Iowa, Missouri). The plant has been reported from Mississippi but no voucher was seen.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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