Eurybia eryngiifolia
Eurybia avita
coyote-thistle aster, thistleleaf aster
Alexander's Rock aster
1–3+, erect, coarse, villous.
1–5+, erect to ascending, simple, strict, slender, stiff, proximally glabrous or glabrate, distally hirtello-puberulent.
strongly basal and cauline, coriaceous, margins indurate, entire to remotely spinose-serrate, remotely and obscurely scabridulous, spines indurate-margined or wholly indurate, finely parallel-veined with evident midnerves, apices acute, revolute, indurate, abaxial faces glabrous;
basal and proximal cauline persistent (bases ± marcescent when leaves deciduous), petioles scarcely distinct, blades linear (grasslike), 70–350 × 3–8 mm, adaxial faces glabrous;
cauline sessile, blades linear to lance-linear, 15–130 × 1.5–7 mm, progressively reduced and more spinose distally, adaxial faces progressively more villous distally.
basal and cauline, firm, blades (1-nerved) linear to lance-linear or oblong-linear (grasslike), 25–140+ × 2–5 mm, ± coriaceous, bases sheathing, margins entire to remotely serrulate-spinose, indurate, remotely scabrous, spines thickened, apices acute, revolute, faces glabrous;
basal and proximal cauline often withering by flowering, bases marcescent, ± long-petiolate;
mid and distal progressively sessile and reduced.
± densely villous, sometimes sparsely stipitate-glandular distally;
bracts 0–7, appressed, lanceolate, bases ± indurate, margins spinose, adaxial faces villous.
densely hirtellous;
bracts 1–2, usually immediately subtending heads.
campanulo-hemispheric, 9–12 mm, slightly shorter than pappi.
cylindro-campanulate, 7–9 mm, shorter than pappi.
25–60;
corollas white or pinkish, coiling, 10–20 × 1–2.1 mm.
8–20;
corollas bluish white to lavender or deep violet, 5–10 × 1–1.7 mm.
115–260;
corollas yellow, 5.5–7 mm, slightly ampliate, tubes shorter than tubular throats, lobes 0.75–1 mm, erect, lanceolate.
15–45;
corollas yellow, 5.5–7 mm, barely ampliate, tubes shorter than narrowly funnelform throats, lobes erect, triangular, 0.6–0.7 mm.
70–140 in 4–5 series, greenish, densely thick-nerved, lanceolate to linear (innermost), unequal, coriaceous, bases indurate and rounded (outer), margins entire, indurate or ± scarious, erose (inner), sometimes sparsely villoso-ciliate, ± densely stipitate-glandular, apices squarrose, green and often purplish-tinged, foliaceous, long-acuminate, adaxial faces villosulous, rarely also sparsely stipitate-glandular.
30–55+ in 4–5 series, unequal, chartaceous, bases indurate, margins narrowly hyaline, scabrous, erose, fimbriate, apices appressed or reflexed, acute, sometimes acuminate (some outer), mucronate, marginally thickened, faces glabrous;
outer lance-oblong, rounded, apical zones dark green, flat;
inner linear-oblong, apical zones pale green, restricted to broadly acute tips.
1–11+, borne singly or in racemiform arrays, branches ascending to erect, stiff.
3–15+ in narrow, flat-topped corymbiform arrays.
straw-colored, ellipsoid to obovoid, 2–3.5 mm, ribs 11–13 prominent, glabrous;
pappi of (ca. 35) orangish tan (coarse, sometimes clavellate) bristles 7.8–8.2 mm, slightly longer than disc corollas.
tan, fusiform, ± compressed, ca. 5 mm, ribs 7–10(–12) (stramineous, broad), strigillose;
pappi of cinnamon to sordid bristles 5.5–6 mm, equaling disc corollas.
= 18.
Eurybia eryngiifolia
Eurybia avita
Eurybia eryngiifolia is known from the Florida panhandle and adjacent areas of southern Georgia and Alabama. The species is of conservation concern in Alabama.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Eurybia avita is known from Stone Mountain (the type location, where it is now extirpated according to R. Kral 1983, vol. 2) and granite flatrocks in Georgia, and from Pickens County in South Carolina, where it is imperiled; it is presumed extirpated from North Carolina (www.natureserve.org). Kral mapped the species; he underlined its similarities to both E. surculosa and E. paludosa and the need for further studies of its relationships.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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