Eurybia radula

(Aiton) G. L. Nesom

Phytologia 77: 261. 1995.

Common names: Low rough aster aster rude
Endemic
Basionym: Aster radula Aiton Hort. Kew. 3: 210. 1789
Synonyms: Aster radula var. strictus A. Gray
Treatment appears in FNA Volume 20. Treatment on page 371. Mentioned on page 78, 81, 366, 367, 372.

Plants 10–100 cm; in lax clones, eglandular; rhizomes elongate or short, filiform or cordlike, herbaceous, remotely scaly. Stems 1, erect, straight, often reddish, simple, glabrous or glabrescent to sparsely villous proximally, villous distally. Leaves 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. Heads 1–25+ in open corymbiform arrays or borne singly. Peduncles ± densely villous; bracts 0–2, sometimes subtending heads. Involucres campanulate, 5.5–9 mm, shorter than pappi. Phyllaries 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. Ray-florets 13–30; corollas pale blue-violet, 10.5–15 × 1.4–2 mm. Disc-florets 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. Cypselae 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 = 18.


Phenology: Flowering late summer–early fall.
Habitat: Fens, sphagnum bogs, lake and creek shores, edges of or openings in wet spruce or tamarack forests, open boggy woods, ± wet meadows, ditches
Elevation: 0–600+ m

Distribution

V20-853-distribution-map.gif

St. Pierre and Miquelon, N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Conn., Del., D.C., Ky., Maine, Md., Mass., N.H., N.J., N.Y., Pa., R.I., Vt., Va., W.Va.

Discussion

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).

Selected References

None.

Lower Taxa

None.

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... more about "Eurybia radula"
not tailed +, rounded +  and obtuse +
winged-petiolate +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
hyaline;paler +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
distinct +
1 cm10 mm <br />0.01 m <br /> (4.2 cm42 mm <br />0.042 m <br />) +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
scarious +
3mm +  and 8mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
corymbiform +  and open +
indeterminate +  and determinate +
Luc Brouillet +
(Aiton) G. L. Nesom +
winged-petiolate +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
2.3 cm23 mm <br />0.023 m <br /> (3 cm30 mm <br />0.03 m <br />) +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
3 cm30 mm <br />0.03 m <br /> (11.5 cm115 mm <br />0.115 m <br />) +
rounded +, tapering +, obtuse +  and acute +
reduced +  and by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
indurate +
5mm;36mm +
Aster radula +
winged-petiolate +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
1 cm10 mm <br />0.01 m <br /> (4.2 cm42 mm <br />0.042 m <br />) +
obtuse;acute +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
3mm;8mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
pale cinnamon +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
Low rough aster +  and aster rude +
not 2-lipped +  and actinomorphic +
yellow +  and pale blue-violet +
1.05 cm10.5 mm <br />0.0105 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
ampliate +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
7-12(-18)-nerved +
beaked +, 2-ribbed +  and 5-ribbed +
tawny +  and stramineous +
compressed +, fusiform +  and cylindro-obconic +
fertile +  and bisexual +
fertile +  and bisexual +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.7 cm7 mm <br />0.007 m <br /> (?) +
St. Pierre and Miquelon +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Del. +, D.C. +, Ky. +, Maine +, Md. +, Mass. +, N.H. +, N.J. +, N.Y. +, Pa. +, R.I. +, Vt. +, Va. +  and W.Va. +
0–600+ m +
glabrous +  and strigillose +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Fens, sphagnum bogs, lake and creek shores, edges of or openings in wet spruce or tamarack forests, open boggy woods, ± wet meadows, ditches +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1.4 cm14 mm <br />0.014 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
campanulate +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
winged-petiolate +  and rugose-veined +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
10mm;42mm +
obtuse;acute +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
lanceolate +
hyaline +  and paler +
obtuse +  and acute +
2-carpellate +
barbellulate +  and barbellate +
pinkish +, yellowish +, tan +, tawny +  and cinnamon +
persistent +
unequal +
winged-petiolate +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
10mm;42mm +
obtuse +  and acute +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
Flowering late summer–early fall. +
oblong-lanceolate seldom ovate lanceolate +  and linear-lanceolate +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
attenuate;cuneate +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
by flowering , winged-petiolate , petiolesby flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apices by flowering , winged-petiolate , petioles equaling or longer than blades , bases more or less sheathing , sometimes marcescent , blades spatulate to oblanceolate , 10-42×3-8 mm , sometimes reduced , smaller than mid leaves , bases attenuate to cuneate , apicesaves , bases attenuate to cuneate , apices +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
cordlike +, filiform +  and elongate +
8 +  and 18 +
exalbuminous +
straight +
appendaged +  and truncate +
papillate +  and smooth +
Aster radula var. strictus +
Eurybia radula +
species +
ampliate +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
mucronulate +, obtuse +  and acute +