Eurybia divaricata

(Linnaeus) G. L. Nesom

Phytologia 77: 259. 1995.

Common names: White wood aster aster à rameaux étalés
Endemic
Basionym: Aster divaricatus Linnaeus Sp. Pl. 2: 873. 1753
Synonyms: Aster boykinii E. S. Burgess Aster castaneus E. S. Burgess Aster corymbosus Aiton Aster corymbosus var. alatus W. P. C. Barton Aster excavatus E. S. Burgess Aster flexilis E. S. Burgess Aster stilettiformis E. S. Burgess Aster tenebrosus de Candolle Biotia corymbosa de Candolle Biotia corymbosa var. alata (W. P. C. Barton) de Candolle Biotia macrophylla var. divaricata (Linnaeus) de Candolle Eurybia corymbosa
Treatment appears in FNA Volume 20. Treatment on page 374. Mentioned on page 366, 375.

Plants 28–90 (–120) cm, in ± dense clones (lacking sterile rosettes); rhizomes branched, elongate, becoming woody. Stems 1, erect, simple, flexuous, glabrate to sparsely puberulent proximally, densely puberulent distally. Leaves basal and cauline, thin, margins sharply serrate, teeth (6–15 per side) mucronulate, ciliate, apices acuminate, abaxial faces sparsely strigose or villous, particularly villous along veins, adaxial glabrescent to sparsely strigose, veins sparsely stipitate-glandular; basal and proximal withering by flowering, petiolate (petioles 20–70 mm), blades ovate, 19–65 × 17–60 mm, basal smaller than proximal, bases cordate (sinuses narrow, curved); cauline petiolate, petioles often ± winged (15–70 mm), blades ovate, 20–200 × 10–100 mm, bases cordate to rounded; distal (arrays) usually sessile, sometimes subpetiolate, blades ovate to lanceolate, 5–20 × 1–8 mm, bases rounded. Heads 4–50 (–100+) in ± flat-topped corymbiform arrays. Peduncles to 1.5 cm, densely hairy, eglandular; bracts 0 (–2). Involucres cylindro-campanulate, 4.2–6 mm, much shorter than pappi. Phyllaries 25–30 in 4–5 series, inner purplish distally, oblong (outer) to lanceolate or linear-lanceolate (inner), strongly unequal, bases indurate, green zones in distal 1/2 (outer) to 1/3 or along distal midveins (inner), margins narrowly scarious, densely fimbriate-ciliate, apices rounded to acute, faces sparsely hairy, sometimes sparsely stipitate-glandular; outer 0.7–1.5 mm wide, lengths seldom more than 2.5 times widths. Ray-florets 5–10 (–12); corollas white, 6–12 × 1.5–2.2 mm. Disc-florets 12–19 (–25); corollas yellow, 4.1–4.8 (–5.5) mm, abruptly ampliate, tubes (2.3–2.6 mm) longer than campanulate throats (0.9–1.2 mm), lobes reflexed, lanceolate, 0.7–1.4 mm. Cypselae brown, cylindro-obovoid, slightly compressed, 2.6–3.8 mm, ribs 7–10 (tan to stramineous), faces sparsely strigillose; pappi of reddish to cream-colored (fine, barbellulate, sometimes apically ± clavate) bristles 3.7–5 mm, equaling or longer than disc corollas. 2n = 18.


Phenology: Flowering late summer–fall.
Habitat: Dry to mesic, eastern deciduous and mixed deciduous woods, edges and clearings, roadsides
Elevation: 0–1200(–1700) m

Distribution

V20-858-distribution-map.gif

Ont., Que., Ala., Conn., Del., D.C., Ga., Ky., Maine, Md., Mass., Mich., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va., in Europe (Netherlands)

Discussion

Eurybia divaricata is a mainly Appalachian element of the eastern North American deciduous forest. It is often confused with Eurybia chlorolepis (see W. F. Lamboy 1992 for distinction between the two species), E. schreberi, or Symphyotrichum cordifolium. Lamboy provided a map of the species.

Selected References

None.

Lower Taxa

None.

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... more about "Eurybia divaricata"
villous +  and strigose +
glabrescent +  and sparsely strigose +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
flat-topped +
Luc Brouillet +
(Linnaeus) G. L. Nesom +
1.9 cm19 mm <br />0.019 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
rounded +  and cordate +
by flowering , petiolate , blades ovate , 19-65×17-60 mm , basal blades smaller than proximal blades , bases +
indurate +
17mm;60mm +
Aster divaricatus +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
flowering +  and withering +
ovate;lanceolate +
by flowering , petiolate , blades ovate , 19-65×17-60 mm , basal blades smaller than proximal blades , bases +
1mm;8mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
reddish +  and cream-colored +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
White wood aster +  and aster à rameaux étalés +
not 2-lipped +  and actinomorphic +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
yellow +  and white +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
ampliate +
0.41 cm4.1 mm <br />0.0041 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
7-12(-18)-nerved +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +  and cylindro-obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
subpetiolate +  and sessile +
Ont. +, Que. +, Ala. +, Conn. +, Del. +, D.C. +, Ga. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, W.Va. +  and in Europe (Netherlands) +
0–1200(–1700) m +
strigillose +, stipitate-glandular +  and hairy +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry to mesic, eastern deciduous and mixed deciduous woods, edges and clearings, roadsides +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
oblong +  and lanceolate or linear-lanceolate +
1.4 cm14 mm <br />0.014 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
cylindro-campanulate +
0.42 cm4.2 mm <br />0.0042 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
lanceolate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
2-carpellate +
barbellulate +  and barbellate +
pinkish +, yellowish +, tan +, tawny +  and cinnamon +
persistent +
unequal +
0 cm0 mm <br />0 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering late summer–fall. +
oblong +  and oblanceolate lanceolate or linear +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
7 +  and 10 +
exalbuminous +
flexuous +
appendaged +  and truncate +
papillate +  and smooth +
Aster boykinii +, Aster castaneus +, Aster corymbosus +, Aster corymbosus var. alatus +, Aster excavatus +, Aster flexilis +, Aster stilettiformis +, Aster tenebrosus +, Biotia corymbosa +, Biotia corymbosa var. alata +, Biotia macrophylla var. divaricata +  and Eurybia corymbosa +
Eurybia divaricata +
species +
campanulate +
mucronulate +
ampliate +
stipitate-glandular +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +