Erigeron speciosus |
Erigeron parryi |
|
---|---|---|
aspen fleabane, showy daisy, showy fleabane, splendid fleabane |
Parry's fleabane |
|
Habit | Perennials, 30–80(–100) cm; rhizomatous, fibrous-rooted, caudices relatively thick. | Perennials, 1.5–5(–15) cm; taprooted, caudices multicipital or with relatively short, thick branches. |
Stems | erect, glabrous or sparsely hirsuto-pilose (hairs 0.5–1 mm), often minutely glandular distally. |
erect, usually hirsute, rarely loosely strigoso-villous, 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; basal blades linear-oblanceolate, 10–25(–50) × 0.8–2 mm; cauline on proximal 1/2–2/3 of stems, gradually reduced distally, margins entire, eciliate (apices rounded to obtuse), faces equally, densely loosely strigose to hirsuto-strigose, eglandular. |
Involucres | 6–9 × 11–22 mm. |
4–7 × 7–10 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. |
20–40; corollas white to pink or bluish, 6–8 mm, laminae not coiling or reflexing. |
Disc corollas | 4–5 mm. |
2.4–3.5 mm. |
Phyllaries | in 2–3(–4) series, usually glabrous, sometimes sparsely hirsuto-pilose, minutely glandular. |
in (2–)3 series (subequal), sparsely to densely villoso-strigose (basal cross walls sometimes purple), sparsely minutely glandular. |
Heads | (2–)4–20 in corymbiform arrays. |
1(–3, rarely). |
Cypselae | 1.5–1.8 mm, 2(–4)-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles. |
2–2.3 mm, 2-nerved, faces densely strigose; pappi: outer of setae or scales, inner of 12–15 (readily falling) bristles. |
Erigeron speciosus |
Erigeron parryi |
|
Phenology | Flowering Jul–Oct. | Flowering Jun–Aug. |
Habitat | Dry or moist, gravelly or loamy soil, prairies, yellow pine, pine-fir, spruce-fir, aspen-spruce | Open, rocky (limestone) slopes and ridgecrests, sagebrush |
Elevation | (600–)900–3400 m ((2000–)3000–11200 ft) | 1300–2200 m (4300–7200 ft) |
Distribution |
AZ; CO; ID; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; Mexico (Baja California)
|
MT; WY |
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.) |
Erigeron parryi mostly has been included within the concept of E. ochroleucus, but two studies (P. Lesica 2005; G. L. Nesom 2004e) independently have confirmed its reality as an endemic of southwestern Montana and adjacent Wyoming. Leaves of E. parryi are equally hairy (usually hirsuto-strigose) on both faces, contrasted with the reduced vestiture (loosely strigose) only on adaxial leaf faces of E. ochroleucus, and the involucral vestiture is of hairs often with purplish cross walls. Also, E. parryi produces branched caudices and smaller heads with fewer rays. Lesica also noted as distinctive the caudex branches thickened by the presence of old leaf bases proximal to the current leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 330. | FNA vol. 20, p. 293. |
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) | Canby & Rose: Bot. Gaz. 15: 65. (1890) |
Web links |