Eurybia integrifolia
Eurybia hemispherica
thick-stem aster
single-stem bog or southern prairie aster, southern prairie aster
1–3+, straight, stout, glabrous or sparsely hispid proximally, distally ± hispido-villous.
1–4, erect or ascending, often reddish, simple, straight to stict, proximally glabrous, distally ± sparsely strigillose (at least arrays).
basal and cauline, firm, margins entire, strigoso-ciliate, distal also stipitate-glandular, apices mucronate, faces glabrous or glabrescent to ± densely hispid or strigose (then ± scabrous), particularly on veins, midveins sometimes notably hispido-villous, proximally ± sparsely, distally ± densely stipitate-glandular;
basal and proximal cauline long-petiolate (to 100+ mm), petioles ± broadly winged, bases sheathing or auriculate-clasping, blades ovate-lanceolate to narrowly elliptic or oblanceolate, 33–180+ × 11–50 mm, bases attenuate, apices acute or obtuse to rounded;
mid sessile, blades oblong or oblanceolate to oblong-lanceolate, lanceolate, or lance-ovate, 30–140 × 7–27 mm, gradually reduced distally, bases auriculate-clasping, apices usually acute, rarely obtuse;
distal (arrays) narrowly ovate to lanceolate, 9–50 × 3–20 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.
± densely long-stipitate-glandular;
bracts 0(–2), densely stipitate-glandular.
2–80 mm or subsessile;
bracts 0–4, linear-lanceolate, 10–35 × 0.5–2 mm, mucronulate, grading into phyllaries.
campanulate, 8–14 mm, much shorter than pappi.
hemispheric, 8–12(–15) mm, shorter than pappi.
8–27;
corollas violet-purple, 10–15 × 1.2–2.2 mm.
15–30;
corollas usually violet-purple, seldom white, (10–)13–15(–20) × 1.3–3 mm.
20–50;
corollas pale yellow turning pinkish or purplish, 6–7.8 mm, slightly ampliate, tubes much shorter than cylindric to narrowly funnelform throats, lobes erect, lanceolate, 0.6–0.8 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.
25–40 in 3–4 series, inner often purplish, oblong-lanceolate (outer) to linear-lanceolate (inner), ± unequal, membranous, bases pale, indurate, sometimes rounded (outer), distally foliaceous (3/4+ in outer, seldom to base, to 1/5 in inner) and wider than bases, margins narrowly scarious (non-foliaceous parts), purplish (at least inner), ciliate and/or stipitate-glandular (along foliaceous parts), apices squarrose, usually acute, sometimes acuminate, faces densely 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.
3–41+ in elongate, racemo-corymbiform arrays, branches ascending.
1–35+ in elongate, usually racemiform to spiciform, sometimes ± flat-topped, corymbiform arrays, branches robust, ascending.
greenish stramineous, fusiform-obconic, slightly compressed, 4.2–4.7 mm, ribs 7–10, faces ± densely hirtellous;
pappi of stramineous to tawny bristles 7–8 mm, ± equaling disc corollas.
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.
= 18.
= 18, 36.
Eurybia integrifolia
Eurybia hemispherica
Eurybia integrifolia is found in mountain ranges bordering the Basin and Range Province, from the Sierra Nevada and Cascade ranges in the west to the Rocky Mountains and Colorado Plateau in the east.
(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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