Eurybia eryngiifolia |
Eurybia furcata |
|
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coyote-thistle aster, thistleleaf aster |
fork aster |
|
Habit | Plants 30–70 cm; in scattered individuals or small clumps, eglandular; rhizomes short, stout, or strong, woody caudices (roots fleshy). | Plants (30–)50–120 cm; strongly in clones or scattered clumps, eglandular; rhizomes elongate, fleshy. |
Stems | 1–3+, erect, coarse, villous. |
1–5+, erect, simple, ± flexuous distally (± ridged from decurrent leaf bases), glabrate proximally, sparsely villous distally. |
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 (grayish green abaxially), bases often oblique, margins serrate, veins prominent, abaxial faces scabrous, adaxial hirsute; basal and proximal cauline withering by flowering (rosettes produced in late season, absent in spring), short-petiolate, petioles winged, sheathing, blades ovate-lanceolate, 40–130 × 20–90 mm, bases rounded to subcordate, apices obtuse to acute; mid short-petiolate, narrowly winged, wings revolute, bases dilated, sheathing, ciliate, blades ovate to lance-ovate, 100–120(–150) × (30–)60–80 mm, gradually reduced distally, bases shallowly cordate or truncate to rounded, margins sharply serrate, teeth mucronate, apices acuminate; distal (arrays) subpetiolate or sessile, ovate, 8–70 × 4–23 mm, bases sheathing or clasping. |
Peduncles | ± densely villous, sometimes sparsely stipitate-glandular distally; bracts 0–7, appressed, lanceolate, bases ± indurate, margins spinose, adaxial faces villous. |
0.5–3(–5) cm, villous; bracts 0–3. |
Involucres | campanulo-hemispheric, 9–12 mm, slightly shorter than pappi. |
campanulate, 6–8(–10) mm, much shorter than pappi. |
Ray florets | 25–60; corollas white or pinkish, coiling, 10–20 × 1–2.1 mm. |
(12–)15–20; corollas white, sometimes becoming pink or lavender, 12–18 × 1–2.5 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. |
25–35+; corollas cream or light yellow becoming purple, 6–7(–8) mm, slightly ampliate, tubes cylindric, lengths about twice funnelform throats, lobes erect, lanceolate, 0.8–1.2 mm (glabrous). |
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. |
ca. 40 in 5 series, oblong (outer) to linear-lanceolate (inner), strongly unequal, membranous, bases indurate and low-keeled or rounded abaxially, green zones in distal 1/4–1/3, obovate, poorly defined, margins hyaline, scarious, villoso-ciliate, inner often purplish, apices appressed, obtuse to rounded, faces villous, eglandular. |
Heads | 1–11+, borne singly or in racemiform arrays, branches ascending to erect, stiff. |
4–32+ in flat-topped, 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. |
brown, fusiform, (2.5–)3–3.5(–4) mm, ribs 8–10(–12), crowded, stramineous to tan, faces ± strigillose; pappi of tawny (apically sometimes clavellate) bristles 6–7 mm, equaling or slightly shorter than disc corollas. |
2n | = 18. |
|
Eurybia eryngiifolia |
Eurybia furcata |
|
Phenology | Flowering late spring–midsummer. | Flowering late Jul–Oct. |
Habitat | Low pine flatwoods, pine savannas, bogs, often on wet sand, on southern coastal plains | Calciphile, ± open habitats (± shade intolerant), limestone, sandstone and dolomite areas, mostly n-facing slopes, seepy bluffs, moist deciduous woods, especially along streams, sometimes disturbed sites |
Elevation | 0–100 m (0–300 ft) | 200–600 m (700–2000 ft) |
Distribution |
AL; FL; GA
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AR; IA; IL; IN; MI; MO; WI
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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.) |
D. H. Les et al. (1991b) studied the population genetics of this restricted taxon, and Les et al. (1992) its distribution and autecology in Wisconsin. J. A. Reinartz and D. H. Les (1994) showed that the species is developing self-compatibility in response to small populations. Eurybia furcata is uncommon throughout its range and is considered endangered or threatened in all states where it occurs; it is known only from historic records in Arkansas. It is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 381. | FNA vol. 20, p. 372. |
Parent taxa | Asteraceae > tribe Astereae > Eurybia | Asteraceae > tribe Astereae > Eurybia |
Sibling taxa | ||
Synonyms | Aster eryngiifolius, Heleastrum chapmanii, Prionopsis chapmanii | Aster furcatus |
Name authority | (Torrey & A. Gray) G. L. Nesom: Phytologia 77: 259. (1995) | (E. S. Burgess) G. L. Nesom: Phytologia 77: 259. (1995) |
Web links |