Eurybia schreberi |
Eurybia merita |
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Schreber's aster, Schreber's wood-aster |
arctic aster, arctic wood-aster, subalpine aster |
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Habit | Plants (20–)40–110 cm, in ± dense clones (with sterile rosettes on short rhizomeds); rhizomes branched, long. | Plants (2–)10–50 cm, clonal and clumped, eglandular; rhizomes creeping to ascending, long or short, scaly, woody with age. |
Stems | 1, erect, simple, straight, proximally glabrous or sparsely villous, distally densely villous. |
1–3+, usually ascending, sometimes decumbent, purplish, occasionally branched basally, sparsely villosulous, densely so distally. |
Leaves | basal and cauline, margins coarsely serrate (proximal) to serrate (distal), strigoso-ciliate, teeth (15–30 per side) mucronulate, apices acuminate, abaxial faces sparsely strigose, long-stipitate-glandular on veins, adaxial sparsely villous, more densely so on veins; basal withering by flowering, petiolate (55–180 mm), bases sheathing, blades broadly ovate, 55–110 × 48–95 mm, bases cordate (with mostly deep, rectangular sinuses); cauline petiolate to (distal) subsessile, petioles (4–100 mm) ± winged, ± clasping, blades ovate to broadly lanceolate, 27–135 × 7–112 mm, bases cordate (sinuses narrower) to rounded or cuneate-rounded; distal (arrays) sessile, ovate to lanceolate, 6–70 × 1–27 mm. |
cauline (dark green abaxially, paler bluish green adaxially) firm, ± markedly veined, margins entire or serrulate, scabrous to strigoso-ciliate, teeth mucronate, slightly indurate, apices obtuse to acute, mucronate, abaxial faces glabrescent to sparsely villous along veins, adaxial glabrescent or sparsely (proximal) to ± densely (distal) villoso-strigose or strigose; proximalmost withering by flowering; proximal narrowly winged-petiolate or sessile, petiole bases sheathing, blades spatulate to obovate or oblanceolate, 10–43 × 2–16 mm, smaller than mid, bases attenuate to cuneate, subclasping (if sessile); mid sessile, blades lanceolate or oblong-lanceolate to oblanceolate, narrowly obovate, or spatulate, 20–80 × 4–35 mm, gradually reduced distally, bases rounded or subauriculate to widely attenuate or cuneate; distal (arrays) sessile, lanceolate to lance-ovate or elliptic to oblanceolate, 6–52 × 1–17 mm, rapidly reduced distally, margins often slightly purplish. |
Peduncles | sparsely to moderately villous, sparsely glandular; bracts 0–1, linear. |
villosulous; bracts 0–3, lanceolate to spatulate, leaflike to distally phyllary-like (bases indurate, margins purplish), mostly foliaceous. |
Involucres | cylindro-campanulate, 5.5–7.5 mm, equal to or shorter than pappi. |
campanulate, 6–9 mm, shorter than pappi. |
Ray florets | 6–12; corollas white, 10.5–13 × 1.5–2.1 mm. |
(10–)14–32; corollas purple to violet, 7–12(–15) × 1–1.7 mm. |
Disc florets | 12–20(–30); corollas yellow, 5–6.8 mm, slightly ampliate, tubes (3.2–3.8 mm) longer than campanulate throats (1.1–1.9 mm), lobes erect to slightly spreading, lanceolate, (0.9–)1.1–1.5(–1.9) mm. |
30–60; corollas pale to cream-yellow, lobes pink-tinged, 5–7.6 mm, slightly ampliate, tubes equaling or slightly longer than funnelform throats, lobes erect, triangular, 0.6–1.3 mm. |
Phyllaries | 23–32 in 4–5 series, oblong (outer) to lanceolate (inner), strongly unequal, bases indurate, dark green zones in distal 1/4 or less (outer), often confined to narrow strip along midnerves or none (inner), margins narrowly scarious, densely villoso-ciliate, apices ± loose, obtuse to rounded, faces glabrous or sparsely villosulous, sometimes sparsely stipitate-glandular. |
30–65 in 4–5 series, often purplish, oblong or lance-oblong (outer) to lance-linear or linear (inner), unequal, membranous, bases indurate, rounded, dark green zones diffusely diamond-shaped to lanceolate in distal 1/3–2/3 (outer, seldom foliaceous) to 1/5 or none (inner), margins ± dark purple, narrowly scarious, erose, densely villoso-ciliate, apices appressed or sometimes loose and ± squarrose, acute to obtuse, often apiculate, faces usually villous, rarely glabrous. |
Heads | 15–100+ in flat-topped, corymbiform arrays. |
(1–)5–50, usually in open to compact, corymbiform arrays, rarely borne singly. |
Cypselae | brown, fusiform to cylindro-obconic, compressed, 3.2–3.7 mm, ribs 6–12, faces glabrous or sparsely strigillose; pappi of (65–70) orangish to burnt orange (fine, barbellulate, sometimes apically clavellate) bristles 5–6.8 mm, ± equaling disc corolla. |
brownish, fusiform-obconic, slightly compressed, ca. 3.4 mm, ribs 8–10 (pale, strong), strigillose; pappi of cinnamon to yellowish bristles 5–6 mm, longer than disc corollas. |
2n | = 54. |
= 36. |
Eurybia schreberi |
Eurybia merita |
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Phenology | Flowering late summer–early fall. | Flowering late summer. |
Habitat | Damp to mesic deciduous (maple, elm, oak), mixed woods, thickets, shaded roadbanks | Open, mesic or dry, rocky areas and woods, clearings, burnt areas, creek banks (rocky, sandy, or gravelly), mostly at subalpine level in mountains, lower in north, Douglas fir, lodgepole pine or spruce forests, subalpine meadows |
Elevation | 0–1200 m (0–3900 ft) | 100–3200 m (300–10500 ft) |
Distribution |
CT; DE; IA; IL; IN; KY; MA; MD; ME; MI; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WI; WV; ON [Introduced in Europe (Scotland)]
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CA; ID; MT; OR; SD; UT; WA; WY; BC
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Discussion | Eurybia schreberi is rare or extirpated in a many states at the northern limit of its range. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Eurybia merita occurs mainly from the Interior Mountains and Plateaus system to the Rocky Mountains, and is disjunct to the Black Hills of South Dakota. It reaches California in Siskyou County; the species has been overlooked in this state (e.g., G. A. Allen 1993) because of misidentification with E. radulina. S. L. Welsh et al. (1987) reported E. sibirica from the Uinta Mountains of Utah (Summit County), which A. Cronquist (1994) attributed to var. merita. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 375. | FNA vol. 20, p. 370. |
Parent taxa | Asteraceae > tribe Astereae > Eurybia | Asteraceae > tribe Astereae > Eurybia |
Sibling taxa | ||
Synonyms | Aster schreberi, Biotia glomerata, Biotia schreberi, E. glomerata | Aster meritus, Aster richardsonii var. meritus, Aster sibiricus var. meritus |
Name authority | (Nees) Nees: Gen. Sp. Aster., 137. (1832) | (A. Nelson) G. L. Nesom: Phytologia 77: 260. (1995) |
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