Eurybia schreberi |
Eurybia radula |
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Schreber's aster, Schreber's wood-aster |
aster rude, low rough aster, rough wood-aster |
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Habit | Plants (20–)40–110 cm, in ± dense clones (with sterile rosettes on short rhizomeds); rhizomes branched, long. | Plants 10–100 cm; in lax clones, eglandular; rhizomes elongate or short, filiform or cordlike, herbaceous, remotely scaly. |
Stems | 1, erect, simple, straight, proximally glabrous or sparsely villous, distally densely villous. |
1, erect, straight, often reddish, simple, glabrous or glabrescent to sparsely villous proximally, villous 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, rugose-veined, margins ± revolute, ± remotely, ± deeply serrate, scabrous, teeth ± indurate (mucronate), apices mucronulate, abaxial faces scabrous, adaxial ± villous, particularly on veins (increasingly so distally); proximalmost withering by flowering, winged-petiolate, petioles equaling or longer than blades, bases ± sheathing, sometimes marcescent, blades spatulate to oblanceolate, 10–42 × 3–8 mm, sometimes reduced, smaller than mid, bases attenuate to cuneate, apices obtuse to acute; mid sessile, lanceolate, oblanceolate, or narrowly obovate to narrowly elliptic or elliptic, (23–)30–115 × 5–36 mm, gradually reduced distally, bases tapering or rounded to ± auriculate-clasping (often narrowed above base), apices acute to acuminate; distal (arrays) sessile, (6–)10–40 × 2–7 mm. |
Peduncles | sparsely to moderately villous, sparsely glandular; bracts 0–1, linear. |
± densely villous; bracts 0–2, sometimes subtending heads. |
Involucres | cylindro-campanulate, 5.5–7.5 mm, equal to or shorter than pappi. |
campanulate, 5.5–9 mm, shorter than pappi. |
Ray florets | 6–12; corollas white, 10.5–13 × 1.5–2.1 mm. |
13–30; corollas pale blue-violet, 10.5–15 × 1.4–2 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. |
37–72; corollas yellow, 4.5–6 mm, slightly ampliate, 4.8–5.8 mm, tube lengths about twice funnelform throats (2.7–3.4 mm), lobes erect, lanceolate, 0.6–1 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. |
30–50 in 4–5 series, oblong or oblong-lanceolate, seldom ovate (outer), lanceolate to linear-lanceolate (inner), strongly unequal, membranous, bases indurate, rounded (outer), green zones full-width, occasionally purplish (inner), in distal 1/2 (outer; rarely 2/3 and foliaceous) to less than 1/6 and paler or none (inner), margins hyaline (seldom purplish), narrowly scarious, ± erose, densely ciliate, apices usually appressed, often squarrose, usually acute, sometimes obtuse, mucronulate, faces glabrous or sparsely strigillose. |
Heads | 15–100+ in flat-topped, corymbiform arrays. |
1–25+ in open corymbiform arrays or 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. |
tawny to stramineous, fusiform to cylindro-obconic, slightly compressed, 2.7–3.5 mm, ribs 8–18 (stramineous or reddish brown), ± crowded, faces glabrous; pappi of pale cinnamon bristles 4.5–5.2 mm, shorter than disc corollas. |
2n | = 54. |
= 18. |
Eurybia schreberi |
Eurybia radula |
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Phenology | Flowering late summer–early fall. | Flowering late summer–early fall. |
Habitat | Damp to mesic deciduous (maple, elm, oak), mixed woods, thickets, shaded roadbanks | Fens, sphagnum bogs, lake and creek shores, edges of or openings in wet spruce or tamarack forests, open boggy woods, ± wet meadows, ditches |
Elevation | 0–1200 m (0–3900 ft) | 0–600+ m (0–2000+ 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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CT; DC; DE; KY; MA; MD; ME; NH; NJ; NY; PA; RI; VA; VT; WV; NB; NL; NS; ON; PE; QC; SPM
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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 radula reaches its northwestern limit south of James Bay in northeastern Ontario, where it is rare (J. C. Semple et al. 2002). It is vulnerable in most of its United States range. Aster radula var. strictus (Pursh) A. Gray (for which no combination exists in Eurybia) appears to be a reduced, more slender plant with 1–8 heads (M. L. Fernald 1950) from more northern parts of the range (Newfoundland and Labrador, northern Quebec, northern Nova Scotia), presumably due to harsher conditions; an entire spectrum of intermediates appears to exist with the typical variety to the south, however, and it is unclear whether the variety should be recognized. It seems that the common name, rough aster, stems from a misinterpretation of the Latin epithet radula, which means scraper (rough would be radulans). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 375. | FNA vol. 20, p. 371. |
Parent taxa | Asteraceae > tribe Astereae > Eurybia | Asteraceae > tribe Astereae > Eurybia |
Sibling taxa | ||
Synonyms | Aster schreberi, Biotia glomerata, Biotia schreberi, E. glomerata | Aster radula, Aster radula var. strictus |
Name authority | (Nees) Nees: Gen. Sp. Aster., 137. (1832) | (Aiton) G. L. Nesom: Phytologia 77: 261. (1995) |
Web links |