Eurybia divaricata

(Linnaeus) G. L. Nesom

Phytologia 77: 259. 1995. 1995

Common names: White wood aster aster à rameaux étalés
Endemic
Basionyms: 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., introduced 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.

... more about "Eurybia divaricata"
Luc Brouillet +
(Linnaeus) G. L. Nesom +
Aster divaricatus +
White wood aster +  and aster à rameaux étalés +
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 introduced in Europe (Netherlands). +
0–1200(–1700) m +
Dry to mesic, eastern deciduous and mixed deciduous woods, edges and clearings, roadsides +
Flowering late summer–fall. +
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 +