Eurybia integrifolia |
Eurybia conspicua |
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thick-stem aster |
showy aster, showy wood-aster, western showy aster |
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Habit | Plants 15–70 cm, usually in clumps, sometimes in large clones, densely long-stipitate-glandular distally; woody, branched, thick, usually short rhizomes or short caudices. | Plants 30–100 cm; forming loose clones, short-stipitate-glandular; rhizomes long to short, woody. |
Stems | 1–3+, straight, stout, glabrous or sparsely hispid proximally, distally ± hispido-villous. |
1, erect, seldom branched proximally, stout, proximally glabrate to villous and sparsely glandular (sometimes to base), distally glabrate, strongly glandular. |
Leaves | basal and cauline, firm, margins entire, strigoso-ciliate, distal also stipitate-glandular, apices mucronate, faces glabrous or glabrescent to ± densely hispid or strigose (then ± scabrous), particularly on veins, midveins sometimes notably hispido-villous, proximally ± sparsely, distally ± densely stipitate-glandular; basal and proximal cauline long-petiolate (to 100+ mm), petioles ± broadly winged, bases sheathing or auriculate-clasping, blades ovate-lanceolate to narrowly elliptic or oblanceolate, 33–180+ × 11–50 mm, bases attenuate, apices acute or obtuse to rounded; mid sessile, blades oblong or oblanceolate to oblong-lanceolate, lanceolate, or lance-ovate, 30–140 × 7–27 mm, gradually reduced distally, bases auriculate-clasping, apices usually acute, rarely obtuse; distal (arrays) narrowly ovate to lanceolate, 9–50 × 3–20 mm. |
cauline, thick, ample, bases clasping, margins ± revolute, sharply serrate (rarely subentire) with ± mucronate teeth, veins prominent, apices acute to acuminate, mucronate, faces scabrous, adaxial veins villous; proximal cauline deciduous by flowering, winged-subpetiolate to sessile, blades oblanceolate to ovate or obovate, smaller than mid, bases tapering; mid usually sessile, sometimes subsessile, obovate or elliptic, (40–)58–140(–180) × (8–)20–50(–80) mm, bases cuneate to mostly rounded-subauriculate; distal (in arrays) sessile, ovate to oblanceolate, lanceolate, or elliptic, (8–)10–60(–90) × 2–28(–40) mm, strongly reduced distally. |
Peduncles | ± densely long-stipitate-glandular; bracts 0(–2), densely stipitate-glandular. |
sometimes sparsely hairy, stipitate-glandular; bracts usually 0, sometimes 1–3. |
Involucres | campanulate, 8–14 mm, much shorter than pappi. |
campanulate, 9–12 mm, shorter than pappi. |
Ray florets | 8–27; corollas violet-purple, 10–15 × 1.2–2.2 mm. |
12–35; corollas blue or violet, (8–)10–15 × 1.2–2 mm. |
Disc florets | 20–50; corollas pale yellow turning pinkish or purplish, 6–7.8 mm, slightly ampliate, tubes much shorter than cylindric to narrowly funnelform throats, lobes erect, lanceolate, 0.6–0.8 mm. |
48–55; corollas yellow, 9–10 mm, slightly ampliate, tubes narrowly cylindric, slightly longer than narrowly funnelform throats, lobes erect, lanceolate, 0.7–1.3 mm. |
Phyllaries | 25–40 in 3–4 series, inner often purplish, oblong-lanceolate (outer) to linear-lanceolate (inner), ± unequal, membranous, bases pale, indurate, sometimes rounded (outer), distally foliaceous (3/4+ in outer, seldom to base, to 1/5 in inner) and wider than bases, margins narrowly scarious (non-foliaceous parts), purplish (at least inner), ciliate and/or stipitate-glandular (along foliaceous parts), apices squarrose, usually acute, sometimes acuminate, faces densely stipitate-glandular. |
34–55 in 4–5 series, midnerves translucent, strongly unequal, membranous, bases indurate, dark green distally, margins densely ciliate, apices spreading or ± squarrose, purple (mucro), acute or acuminate (sometimes mucronate), faces glabrous, densely stipitate-glandular; outer ovate or lanceolate; inner oblong-lanceolate, margins hyaline, often purplish distally, scarious. |
Heads | 3–41+ in elongate, racemo-corymbiform arrays, branches ascending. |
5–50 in open corymbiform arrays. |
Cypselae | greenish stramineous, fusiform-obconic, slightly compressed, 4.2–4.7 mm, ribs 7–10, faces ± densely hirtellous; pappi of stramineous to tawny bristles 7–8 mm, ± equaling disc corollas. |
tan, fusiform, ± compressed, 3–4 mm, ribs 8–10, appressed-setose; pappi of cinnamon to pinkish bristles 9–10 mm, about as long as disc corollas. |
2n | = 18. |
= ca. 108, ca. 122. |
Eurybia integrifolia |
Eurybia conspicua |
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Phenology | Flowering summer–early fall. | Flowering summer–fall. |
Habitat | Drier meadows, open, moist woodlands, in sedge-willow, sagebrush, Douglas fir, and spruce communities | Open, mesic conifer (spruce-fir, pine, or aspen-conifer) or aspen woods, from foothills to upper montane zone, mesic to dry meadows, forest openings, in somewhat clayey soils, adapted to spring fires |
Elevation | 1600–3200 m (5200–10500 ft) | 300–2500 m (1000–8200 ft) |
Distribution |
CA; ID; MT; NV; OR; UT; WA; WY
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ID; MT; OR; SD; WA; WY; AB; BC; MB; SK
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Discussion | Eurybia integrifolia is found in mountain ranges bordering the Basin and Range Province, from the Sierra Nevada and Cascade ranges in the west to the Rocky Mountains and Colorado Plateau in the east. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Eurybia conspicua is a western boreo-montane taxon; it ranges from the Interior Mountains and Plateaus to the Rocky Mountains, and spreads onto the northern Great Plains in the aspen parklands-southern boreal forests of Canada, barely into western Manitoba. It is disjunct to the Black Hills (South Dakota) and Cypress Hills (Alberta-Saskatchewan). It stops at the Canadian Shield due to soil preferences (A. J. Breitung 1988). This taxon has the highest chromosome number in the genus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 368. | FNA vol. 20, p. 368. |
Parent taxa | Asteraceae > tribe Astereae > Eurybia | Asteraceae > tribe Astereae > Eurybia |
Sibling taxa | ||
Synonyms | Aster integrifolius, Aster amplexifolius | Aster conspicuus |
Name authority | (Nuttall) G. L. Nesom: Phytologia 77: 260. (1995) | (Lindley) G. L. Nesom: Phytologia 77: 259. (1995) |
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