Erigeron robustior |
Erigeron speciosus |
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robust daisy, white cushion fleabane, Willamette fleabane |
aspen fleabane, showy daisy, showy fleabane, splendid fleabane |
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Habit | Perennials, (15–)25–55 cm (not colonial); taprooted, taproots thin (2–3 mm wide), caudices simple or with relatively slender and short, erect branches. | Perennials, 30–80(–100) cm; rhizomatous, fibrous-rooted, caudices relatively thick. |
Stems | (often purplish) erect or decumbent, sparsely strigillose (basal cells inclined, hairs even-width), eglandular. |
erect, glabrous or sparsely hirsuto-pilose (hairs 0.5–1 mm), often minutely glandular distally. |
Leaves | basal (often withering by flowering) and cauline; basal blades (3-nerved) linear to narrowly oblanceolate, 90–170 × 3–7 mm; cauline gradually reduced distally, ending proximal to heads, margins entire, faces strigoso-hirsute, eglandular. |
basal (usually withering by flowering) and cauline; basal blades oblanceolate-spatulate, 30–80(–150) × 4–18(–28) mm, margins entire, often ciliate (main veins sometimes also), faces glabrous, eglandular or distal sparsely minutely glandular; cauline blades ovate to ovate-lanceolate, oblong-lanceolate, or lanceolate, nearly even-sized distally or sometimes mid largest (continuing to immediately below heads, bases usually clasping to subclasping). |
Involucres | 6–8.5 × (12–)14–20 mm. |
6–9 × 11–22 mm. |
Ray florets | 21–36; corollas 7–15(–19) mm, laminae white to pinkish, not coiling or reflexing. |
75–150; corollas blue to lavender, rarely whitish, 8–16 mm (mostly 1 mm wide), laminae slightly coiling at least at tips. |
Disc corollas | 3.5–4.5 mm. |
4–5 mm. |
Phyllaries | in 2–3(–4) series (narrowly oblanceolate to lanceolate, acute-acuminate), sparsely to moderately hirsute to villous, eglandular. |
in 2–3(–4) series, usually glabrous, sometimes sparsely hirsuto-pilose, minutely glandular. |
Heads | 1–3. |
(2–)4–20 in corymbiform arrays. |
Cypselae | (1.8–)2–3.2 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 15–22 bristles. |
1.5–1.8 mm, 2(–4)-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles. |
Erigeron robustior |
Erigeron speciosus |
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Phenology | Flowering Jun–Jul. | Flowering Jul–Oct. |
Habitat | Rocky or gravelly slopes, sometimes over serpentine, glades and meadows, seeps, sagebrush-scrub, proximal montane coniferous forest | Dry or moist, gravelly or loamy soil, prairies, yellow pine, pine-fir, spruce-fir, aspen-spruce |
Elevation | (200–)700–1500 m ((700–)2300–4900 ft) | (600–)900–3400 m ((2000–)3000–11200 ft) |
Distribution |
CA
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AZ; CO; ID; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; Mexico (Baja California)
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Discussion | The population in Baja California is disjunct from the closest range in Arizona and northern Nevada. Plants glabrous and glandular on the phyllaries, stems, and leaves have been recognized as var. macranthus; they intergrade with hairier forms and do not show a coherent geographic pattern. Plants commonly identified as Erigeron subtrinervis var. conspicuus usually have stems sparsely hirsuto-pilose with hairs 1–1.5 mm, and the leaves commonly are ciliate on the margins and veins. As implied in the nomenclatural combination by Breitung, those plants are more similar to E. speciosus than to E. subtrinervis, and they apparently show part of the greater variability of E. speciosus in the northwestern part of its range (Alberta, British Columbia, Idaho, Montana, Oregon, Washington, and Wyoming), where more typical plants also occur. Erigeron speciosus and E. subtrinervis are sympatric over large parts of their ranges and appear to be at least partially reproductively isolated entities, although intermediates are frequently encountered. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 20, p. 279. | FNA vol. 20, p. 330. |
Parent taxa | Asteraceae > tribe Astereae > Erigeron | Asteraceae > tribe Astereae > Erigeron |
Sibling taxa | ||
Synonyms | E. decumbens subsp. robustior, E. decumbens var. robustior | Stenactis speciosa, E. conspicuus, E. macranthus, E. speciosus var. conspicuus, E. speciosus var. macranthus, E. subtrinervis subsp. conspicuus, E. subtrinervis var. conspicuus |
Name authority | (Cronquist) G. L. Nesom: Sida 21: 21. (2004) | (Lindley) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 284. (1836) |
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