Eurybia radulina
Eurybia surculosa
rough-leaf aster, rough-leaf wood-aster
creeping aster
1–3, ascending to erect, often purple, simple, flexuous, proximally glabrescent or sparsely villous, distally ± densely villous.
1–3+, erect, simple, straight, proximally sparsely strigillose to glabrescent, distally strigose or villoso- or hirsuto-strigose.
cauline, firm, margins slightly revolute, coarsely serrate or (distal) entire, scabrous to strigoso-ciliate, teeth mucronate, ± markedly veined, apices mucronate, abaxial faces scabrous, adaxial scabroso-strigose;
proximal mostly withering by flowering, petioles winged, shorter than blades, bases clasping, blades elliptic to obovate 12–45+ × 7–20+ mm, smaller than mid, apices obtuse;
mid narrowly winged-petiolate (petioles short with ± clasping bases), distally subpetiolate or sessile, blades ovate or elliptic to broadly oblanceolate or obovate, 32–85(–130) × 4–40 mm, gradually reduced distally, bases usually attenuate, sometimes cuneate, apices obtuse to acute;
distal (arrays) oblanceolate to lanceolate, 5–28 × 1–8 mm, more sharply reduced.
basal and cauline, firm (only midnerves conspicuous), margins slightly revolute, slightly indurate, entire or sometimes remotely crenulate-serrulate, scabrous, teeth indurate, apices acute to obtuse, indurate, often mucronate, abaxial faces scabrous, adaxial sparsely strigose or glabrous;
basal and proximal cauline usually persistent, sometimes withering by flowering (bases often marcescent), petioles sometimes narrowly winged, bases sheathing, blades narrowly elliptic, narrowly ovate, or lanceolate to spatulate, narrowly obovate, or oblanceolate, 13–135 × (2–)6–35 mm (earliest smaller), bases attenuate to cuneate;
mid short-winged-petiolate or sessile, blades lance-oblong, lance-elliptic, lanceolate, or oblanceolate, 22–105 × 3–14 mm, gradually reduced distally, bases slightly auriculate-clasping to cuneate or attenuate;
distal (arrays) sessile, blades lanceolate to linear, 7–42 × 1–6 mm, abruptly reduced.
densely villous;
bracts 0–1, scabroso-strigose.
densely strigose or strigoso-hispid, sometimes sparsely long-stipitate-glandular distally;
bracts (0–)1–3(–6), leaflike to phyllary-like (bases indurate), scabrous or sparsely strigose.
campanulate, 6–9 mm, shorter than pappi.
cylindro-campanulate, 7–11(–13) mm, shorter than pappi.
10–15;
corollas white to sometimes pale violet or purple, 8.5–11(–13) × 1.3–2.3 mm.
13–30;
corollas bluish violet, (8–)11.5–15.5 × 1.5–2.3 mm.
30–70;
corollas yellow becoming purple- or pinkish-tinged, 6–7(–8) mm, ± ampliate, tubes equaling to longer than funnelform-campanulate throats, lobes usually erect, sometimes ± spreading, lanceolate, 1–1.3 mm.
25–40;
corollas pale yellow turning purplish, 5–7.2 mm, slightly ampliate, tubes shorter than funnelform throats, lobes erect, deltate to triangular, 0.75–1.1 mm.
38–62 in 4–5 series, midnerves slightly raised (outer), oblong (outer) to lanceolate-linear or linear (inner), unequal, membranous, bases indurate, ± rounded, green zones to scarious margins in distal 1/3–1/2 (outer; seldom ± wholly foliaceous) to 1/5 or none (inner), margins often purple, hyaline, narrowly scarious, erose, densely villoso-ciliate, apices appressed, sometimes purplish-tinged, usually acute, sometimes obtuse, adaxial faces villous.
35–65 in 4–5 series, oblong (outer) to linear-oblong or seldom linear (inner), strongly unequal, membranous, bases indurate, rounded (outer), dark green zones foliaceous, sometimes slightly dilated, in distal 1/3–1/2 (outer) to 1/8–1/7 or none and not reaching margins (inner), margins hyaline or sometimes purplish, narrowly scarious, erose, ciliate (scarious parts), ± scabrous (foliaceous parts), sometimes short-stipitate-glandular (innermost), apices spreading to squarrose, obtuse, often dilated (innermost), mucronulate (outer) or apiculate (inner), abaxial faces glabrous or strigillose, both scabrellous on foliaceous parts.
5–30+ in flat-topped, corymbiform arrays.
(1–)3–50(–122+), usually in open or dense, corymbiform arrays, seldom borne singly.
tawny, fusiform, 3–3.5 mm, slightly compressed, ribs 7–9 (brown, translucent), faces strigillose;
pappi of tawny bristles 2.7–3 mm, ± equaling disc corollas.
brown, cylindro-obconic, slightly compressed, 3.2–3.5 mm, ribs 8–10, stramineous, strigillose;
pappi of tawny-yellowish to pinkish bristles 5.2–7.1 mm, ± equaling disc corollas.
= 18, 27.
= 36.
Eurybia radulina
Eurybia surculosa
Eurybia radulina is confined mostly west of the Cascades, from southern Vancouver Island (British Columbia) to the southern Coast Ranges, north Channel Islands, and central Sierra Nevada in California. It often is confused with E. merita in the western, coastal states where both are found, though populations are rarely if ever sympatric, the former apparently thriving at lower elevations than the latter.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Eurybia surculosa is of conservation concern in Virginia and Alabama. It is often confused with E. compacta, its close relative from the coastal plains. In states where both are present, it is found only inland in the southern Appalachian Mountains and not on the coastal plains; its larger heads help to differentiate it from E. compacta.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
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