Eurybia schreberi
Eurybia hemispherica
Schreber's aster, Schreber's wood-aster
single-stem bog or southern prairie aster, southern prairie aster
1, erect, simple, straight, proximally glabrous or sparsely villous, distally densely villous.
1–4, erect or ascending, often reddish, simple, straight to stict, proximally glabrous, distally ± sparsely strigillose (at least arrays).
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.
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.
sparsely to moderately villous, sparsely glandular;
bracts 0–1, linear.
2–80 mm or subsessile;
bracts 0–4, linear-lanceolate, 10–35 × 0.5–2 mm, mucronulate, grading into phyllaries.
cylindro-campanulate, 5.5–7.5 mm, equal to or shorter than pappi.
hemispheric, 8–12(–15) mm, shorter than pappi.
6–12;
corollas white, 10.5–13 × 1.5–2.1 mm.
15–30;
corollas usually violet-purple, seldom white, (10–)13–15(–20) × 1.3–3 mm.
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.
(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.
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.
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.
15–100+ in flat-topped, corymbiform arrays.
1–35+ in elongate, usually racemiform to spiciform, sometimes ± flat-topped, corymbiform arrays, branches robust, ascending.
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.
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.
= 54.
= 18, 36.
Eurybia schreberi
Eurybia hemispherica
Eurybia schreberi is rare or extirpated in a many states at the northern limit of its range.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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