Eurybia macrophylla
Eurybia radula
aster à grandes feuilles, bigleaf aster, large-leaf wood-aster
aster rude, low rough aster, rough wood-aster
1, erect, simple, straight to ± flexuous, glabrous or sparsely villous, stipitate-glandular, more densely so distally (at least in arrays).
1, erect, straight, often reddish, simple, glabrous or glabrescent to sparsely villous proximally, villous distally.
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.
cauline, rugose-veined, margins ± revolute, ± remotely, ± deeply serrate, scabrous, teeth ± indurate (mucronate), apices mucronulate, abaxial faces scabrous, adaxial ± villous, particularly on veins (increasingly so distally);
proximalmost withering by flowering, winged-petiolate, petioles equaling or longer than blades, bases ± sheathing, sometimes marcescent, blades spatulate to oblanceolate, 10–42 × 3–8 mm, sometimes reduced, smaller than mid, bases attenuate to cuneate, apices obtuse to acute;
mid sessile, lanceolate, oblanceolate, or narrowly obovate to narrowly elliptic or elliptic, (23–)30–115 × 5–36 mm, gradually reduced distally, bases tapering or rounded to ± auriculate-clasping (often narrowed above base), apices acute to acuminate;
distal (arrays) sessile, (6–)10–40 × 2–7 mm.
firm, 0–4 cm, densely stipitate-glandular;
bracts 0–2, ovate-lanceolate, ± stipitate-glandular.
± densely villous;
bracts 0–2, sometimes subtending heads.
broadly campanulate to campanulate, (6–)7–11 mm, shorter than pappi.
campanulate, 5.5–9 mm, shorter than pappi.
9–20;
corollas ± deep lavender or violet to occasionally white, (7–)11–15 × 1.4–2.4 mm.
13–30;
corollas pale blue-violet, 10.5–15 × 1.4–2 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.
37–72;
corollas yellow, 4.5–6 mm, slightly ampliate, 4.8–5.8 mm, tube lengths about twice funnelform throats (2.7–3.4 mm), lobes erect, lanceolate, 0.6–1 mm.
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.
30–50 in 4–5 series, oblong or oblong-lanceolate, seldom ovate (outer), lanceolate to linear-lanceolate (inner), strongly unequal, membranous, bases indurate, rounded (outer), green zones full-width, occasionally purplish (inner), in distal 1/2 (outer; rarely 2/3 and foliaceous) to less than 1/6 and paler or none (inner), margins hyaline (seldom purplish), narrowly scarious, ± erose, densely ciliate, apices usually appressed, often squarrose, usually acute, sometimes obtuse, mucronulate, faces glabrous or sparsely strigillose.
(2–)8–90+ in flat-topped, corymbiform arrays.
1–25+ in open corymbiform arrays or borne singly.
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.
tawny to stramineous, fusiform to cylindro-obconic, slightly compressed, 2.7–3.5 mm, ribs 8–18 (stramineous or reddish brown), ± crowded, faces glabrous;
pappi of pale cinnamon bristles 4.5–5.2 mm, shorter than disc corollas.
= 72.
= 18.
Eurybia macrophylla
Eurybia radula
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.)
Eurybia radula reaches its northwestern limit south of James Bay in northeastern Ontario, where it is rare (J. C. Semple et al. 2002). It is vulnerable in most of its United States range. Aster radula var. strictus (Pursh) A. Gray (for which no combination exists in Eurybia) appears to be a reduced, more slender plant with 1–8 heads (M. L. Fernald 1950) from more northern parts of the range (Newfoundland and Labrador, northern Quebec, northern Nova Scotia), presumably due to harsher conditions; an entire spectrum of intermediates appears to exist with the typical variety to the south, however, and it is unclear whether the variety should be recognized. It seems that the common name, rough aster, stems from a misinterpretation of the Latin epithet radula, which means scraper (rough would be radulans).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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