Erigeron speciosus |
Erigeron hyperboreus |
|
---|---|---|
aspen fleabane, showy daisy, showy fleabane, splendid fleabane |
tundra fleabane |
|
Habit | Perennials, 30–80(–100) cm; rhizomatous, fibrous-rooted, caudices relatively thick. | Perennials, 3–15 cm; rhizomatous, fibrous-rooted, sometimes with branched, rhizomelike caudices. |
Stems | erect, glabrous or sparsely hirsuto-pilose (hairs 0.5–1 mm), often minutely glandular distally. |
erect to basally ascending, hirsute to hirsuto-villous (hair cross walls purplish black), minutely glandular (conspicuously so near heads). |
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). |
mostly basal (persistent) or basal and cauline; basal blades narrowly oblanceolate to narrowly oblanceolate-spatulate 10–50(–60) × 1.5–6 mm; cauline linear and reduced distally, margins entire (apices acute to obtuse), faces hirsute, eglandular. |
Involucres | 6–9 × 11–22 mm. |
5–8 × 9–15 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. |
30–60; corollas white to blue, drying white or pink, purple, or blue, 7–15 mm (mostly 1–2 mm wide), laminae coiling. |
Disc corollas | 4–5 mm. |
3.5–5 mm. |
Phyllaries | in 2–3(–4) series, usually glabrous, sometimes sparsely hirsuto-pilose, minutely glandular. |
in 2(–3) series (usually dark purple), hirsute to villous (hair cross walls purplish black), minutely glandular. |
Heads | (2–)4–20 in corymbiform arrays. |
1. |
Cypselae | 1.5–1.8 mm, 2(–4)-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles. |
1.7–2 mm, 2-nerved, faces densely strigoso-hirsute; pappi: outer of setae (inconspicuous), inner of 15–20 bristles. |
2n | = 18. |
|
Erigeron speciosus |
Erigeron hyperboreus |
|
Phenology | Flowering Jul–Oct. | Flowering Jun–Aug. |
Habitat | Dry or moist, gravelly or loamy soil, prairies, yellow pine, pine-fir, spruce-fir, aspen-spruce | Ridges, rocky slopes, limestone scree, talus, serpentine fell fields, sandy tidal pools, grassy pockets in tundra, dryas heath, heath tundra |
Elevation | (600–)900–3400 m ((2000–)3000–11200 ft) | (30–)100–900(–2400) m ((100–)300–3000(–7900) ft) |
Distribution |
AZ; CO; ID; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; Mexico (Baja California)
|
AK; YT |
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.) |
Some plants in each of two collections of Erigeron hyperboreus from Alaska (Parker 755, ALA; Murray 8514, ALA) have glabrous or glabrate leaves, stems, and phyllaries; other plants of the same populations are more typical and intermediacy is evident. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 330. | FNA vol. 20, p. 325. |
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 | E. alaskanus |
Name authority | (Lindley) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 284. (1836) | Greene: Pittonia 2: 227. (1892) |
Web links |