Erigeron glabellus |
Erigeron speciosus |
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smooth daisy, smooth fleabane, streamside fleabane |
aspen fleabane, showy daisy, showy fleabane, splendid fleabane |
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Habit | Biennials or perennials, 7–50(–70) cm; rhizomatous, caudices or rhizomes relatively short and thickened, simple or branched, usually appearing merely fibrous-rooted. | Perennials, 30–80(–100) cm; rhizomatous, fibrous-rooted, caudices relatively thick. | ||||
Stems | erect or slightly basally ascending, hirsute or hirsuto-villous to strigose or glabrate, eglandular. |
erect, glabrous or sparsely hirsuto-pilose (hairs 0.5–1 mm), often minutely glandular distally. |
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Leaves | basal (persistent) and cauline; basal blades oblanceolate to oblanceolate-spatulate, 40–150 × 3–15 mm, margins usually entire, sometimes shallowly dentate, faces hirsute or hirsuto-villous to sparsely strigose or glabrate, eglandular; cauline blades usually becoming lanceolate, abruptly or gradually reduced distally (bases sometimes subclasping). |
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). |
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Involucres | 5–9 × 10–20 mm. |
6–9 × 11–22 mm. |
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Ray florets | 125–175; corollas white to pink or blue, 8–15 mm, laminae (nearly filiform) coiling tardily at tips. |
75–150; corollas blue to lavender, rarely whitish, 8–16 mm (mostly 1 mm wide), laminae slightly coiling at least at tips. |
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Disc corollas | 4–5.5 mm. |
4–5 mm. |
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Phyllaries | in (2–)3–4 series (greenish), hirsute to strigose, eglandular. |
in 2–3(–4) series, usually glabrous, sometimes sparsely hirsuto-pilose, minutely glandular. |
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Heads | 1–15. |
(2–)4–20 in corymbiform arrays. |
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Cypselae | 1.2–1.5 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 16–20 bristles. |
1.5–1.8 mm, 2(–4)-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles. |
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Erigeron glabellus |
Erigeron speciosus |
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Phenology | Flowering Jul–Oct. | |||||
Habitat | Dry or moist, gravelly or loamy soil, prairies, yellow pine, pine-fir, spruce-fir, aspen-spruce | |||||
Elevation | (600–)900–3400 m ((2000–)3000–11200 ft) | |||||
Distribution |
AK; CO; ID; MN; MT; ND; NM; SD; UT; WI; WY; AB; BC; MB; NT; ON; SK; YT
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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 | Varieties 2 (2 in the flora). Erigeron glabellus is recognized by its subsimple caudices and fibrous-rooted bases, relatively numerous rays with nearly filiform laminae, and nonglandular vestiture. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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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Key |
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Source | FNA vol. 20, p. 331. | FNA vol. 20, p. 330. | ||||
Parent taxa | Asteraceae > tribe Astereae > Erigeron | Asteraceae > tribe Astereae > Erigeron | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Stenactis speciosa, E. conspicuus, E. macranthus, E. speciosus var. conspicuus, E. speciosus var. macranthus, E. subtrinervis subsp. conspicuus, E. subtrinervis var. conspicuus | |||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 147. (1818) | (Lindley) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 284. (1836) | ||||
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