Erigeron speciosus |
Erigeron maniopotamicus |
|
---|---|---|
aspen fleabane, showy daisy, showy fleabane, splendid fleabane |
Mad River fleabane, Mad River fleabane daisy |
|
Habit | Perennials, 30–80(–100) cm; rhizomatous, fibrous-rooted, caudices relatively thick. | Perennials, 10–22(–27) cm, tap-rooted, caudices usually simple, rarely with branches to 20 cm. |
Stems | erect, glabrous or sparsely hirsuto-pilose (hairs 0.5–1 mm), often minutely glandular distally. |
ascending to decumbent-ascending (usually basally purplish), sparsely to densely strigose (basal cells inclined, hairs even-width), eglandular. |
Leaves | 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). |
basal (persistent) and cauline; blades (strongly to weakly 3-nerved) oblanceolate to spatulate-oblanceolate, 30–100 × (3–)5–12(–14) mm, cauline gradually reduced distally or not, usually continuing to near heads, margins entire, faces hirsuto-pilose to weakly pilose, eglandular. |
Involucres | 6–9 × 11–22 mm. |
(5–)6–7 × 9–12(–14) mm. |
Ray florets | 75–150; corollas blue to lavender, rarely whitish, 8–16 mm (mostly 1 mm wide), laminae slightly coiling at least at tips. |
(16–)21–33; corollas white to pinkish or purplish, 10–12 mm, laminae not (or weakly) coiling or reflexing. |
Disc corollas | 4–5 mm. |
3.2–3.8 mm. |
Phyllaries | in 2–3(–4) series, usually glabrous, sometimes sparsely hirsuto-pilose, minutely glandular. |
in 2–3(–4) series, (elliptic- to oblong-oblanceolate, abruptly acuminate), hirsuto-strigose to -pilose, densely villous at bases, usually eglandular, sometimes sparsely glandular. |
Heads | (2–)4–20 in corymbiform arrays. |
1(–4) (on peduncles 0.5–5 cm), held well beyond leaves at peak flowering, from branches near midstem (or slightly more distal). |
Cypselae | 1.5–1.8 mm, 2(–4)-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles. |
2–2.5 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 16–20 bristles. |
Erigeron speciosus |
Erigeron maniopotamicus |
|
Phenology | Flowering Jul–Oct. | Flowering Jun–Aug. |
Habitat | Dry or moist, gravelly or loamy soil, prairies, yellow pine, pine-fir, spruce-fir, aspen-spruce | Dry, barren meadows and openings in mixed conifer woodlands |
Elevation | (600–)900–3400 m ((2000–)3000–11200 ft) | 1300–1500 m (4300–4900 ft) |
Distribution |
AZ; CO; ID; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; Mexico (Baja California)
|
CA |
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.) |
Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 330. | FNA vol. 20, p. 279. |
Parent taxa | Asteraceae > tribe Astereae > Erigeron | Asteraceae > tribe Astereae > Erigeron |
Sibling 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 | (Lindley) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 284. (1836) | G. L. Nesom & T. W. Nelson: Sida 21: 673, fig. 1. (2004) |
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