Eurybia eryngiifolia |
Eurybia ×herveyi |
|
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coyote-thistle aster, thistleleaf aster |
aster, Hervey's aster |
|
Habit | Plants 30–70 cm; in scattered individuals or small clumps, eglandular; rhizomes short, stout, or strong, woody caudices (roots fleshy). | Plants 25–70+ cm; in clones and clumps (with sterile rosettes), stipitate-glandular distally; rhizomes branched, herbaceous becoming woody. |
Stems | 1–3+, erect, coarse, villous. |
1–3+, erect, straight, proximally glabrous, distally sometimes sparsely strigose, stipitate-glandular. |
Leaves | 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, margins slightly revolute, crenate-serrate, scabrous, apices acuminate and mucronate, abaxial faces usually glabrescent to ± scabrous, sometimes ± sparsely strigose, gland-dotted or stipitate-glandular, adaxial sparsely puberulent, stipitate-glandular (increasingly so distally); basal withering by flowering, long-petiolate, petioles slightly winged, bases dilated and sheathing, sparsely ciliate, ± glandular, blades ovate to elliptic-ovate, 70–120 × 40–65 mm, bases rounded to sometimes slightly oblique; proximal cauline long-petiolate, petioles shorter and gradually more broadly winged distally, blades ovate to elliptic-ovate, 55–100 × 24–65 mm, gradually reduced distally; distal winged-petiolate to subpetiolate or sessile, blades ovate or elliptic to lanceolate or oblanceolate, 10–64 × 3–18 mm, gradually reduced distally, bases ± clasping, margins becoming entire (arrays). |
Peduncles | ± densely villous, sometimes sparsely stipitate-glandular distally; bracts 0–7, appressed, lanceolate, bases ± indurate, margins spinose, adaxial faces villous. |
firm, straight, 0.4–3.5 cm, sparsely strigose, densely stipitate-glandular; bracts 0–3, oblong-lanceolate, 3–5 mm, acute, densely stipitate-glandular. |
Involucres | campanulo-hemispheric, 9–12 mm, slightly shorter than pappi. |
campanulate, (6–)7–11 mm, shorter than pappi. |
Ray florets | 25–60; corollas white or pinkish, coiling, 10–20 × 1–2.1 mm. |
10–11; corollas ± purple, 13.1–13.5 × 1.6–2 mm. |
Disc florets | 115–260; corollas yellow, 5.5–7 mm, slightly ampliate, tubes shorter than tubular throats, lobes 0.75–1 mm, erect, lanceolate. |
25–40; corollas cream or light yellow, becoming pinkish, 7.6–8.5 mm, slightly ampliate, tubes longer than narrowly funnelform-campanulate throats, lobes erect, lanceolate-acuminate, 0.9–1.4 mm. |
Phyllaries | 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. |
(18–)25–40 in (4–)5–6 series, appressed, lanceolate (outer) or lance-ovate to oblong or linear-oblong (inner; innermost longer than 7 mm), strongly unequal, bases indurate, rounded adaxially, dark-green zones obovate to lanceolate (inner), ca. 1/3 distal portion, margins hyaline or often purplish (inner), scarious, erose, ± ciliate, apices (at least some) reflexed, ± squarrose, or twisted, rounded to obtuse (outer) or acute (inner), abaxial faces stipitate-glandular. |
Heads | 1–11+, borne singly or in racemiform arrays, branches ascending to erect, stiff. |
(3–)8–19+ in open, corymbiform arrays. |
Cypselae | 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. |
dark reddish brown, cylindro-fusiform, compressed, ca. 3 mm (sterile or undeveloped), ribs [not seen], faces strigillose; pappi of tawny, (sometimes apically ± clavate) bristles 7.6–8+ mm, equaling disc corollas. |
2n | = 72. |
|
Eurybia eryngiifolia |
Eurybia ×herveyi |
|
Phenology | Flowering late spring–midsummer. | Flowering fall. |
Habitat | Low pine flatwoods, pine savannas, bogs, often on wet sand, on southern coastal plains | Open woods, clearings, often sandy or acidic substrates |
Elevation | 0–100 m (0–300 ft) | 0–100 m (0–300 ft) |
Distribution |
AL; FL; GA
|
CT; MA; NJ; NY; RI |
Discussion | 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.) |
Eurybia ×herveyi is the F1 hybrid between E. macrophylla and E. spectabilis. L. J. Uttal (1962) proved its origin with artificial crosses, and pointed out that the two parents co-occur in some populations where their ranges overlap. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 381. | FNA vol. 20, p. 376. |
Parent taxa | Asteraceae > tribe Astereae > Eurybia | Asteraceae > tribe Astereae > Eurybia |
Sibling taxa | ||
Synonyms | Aster eryngiifolius, Heleastrum chapmanii, Prionopsis chapmanii | Aster herveyi |
Name authority | (Torrey & A. Gray) G. L. Nesom: Phytologia 77: 259. (1995) | (A. Gray) G. L. Nesom: Phytologia 77: 262. (1995) |
Web links |