Erigeron speciosus(synonym of Erigeron subtrinervis) |
Erigeron filifolius |
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showy daisy, showy fleabane |
threadleaf fleabane |
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Habit | Plants perennial, 15–75 cm; rhizomatous, fibrous-rooted, caudices branching. | Plants perennial, 9–40 cm; taprooted, with branching caudices. |
Stems | erect; surfaces glabrous to rarely remotely hirsute, sometimes minutely glandular distally. |
erect, moderately to densely strigose, eglandular. |
Basal leaves | usually withering by flowering, oblanceolate to spatulate. |
persistent, linear to filiform, 20–80 × 0.5–2 mm; margins entire; tips rounded to acute or acuminate; surfaces moderately to densely strigose. |
Cauline leaves | lanceolate, 20–80 × 5–15 mm, gradually reduced distally, bases ± clasping; margins entire, usually long-ciliate; surfaces glabrous, rarely remotely strigose. |
gradually reduced distally or not. |
Involucres | 3–7 × 11–16 mm. |
4–6 × 7–11 mm. |
Ray florets | 40–115+, lavender to purple; rays 7–11 × 0.7–1.5 mm. |
20–40, white to purple; rays 3–9 × 0.7–1.5 mm. |
Disc florets | 2–3 mm. |
corollas 2–4 mm. |
Phyllaries | in 2–3+ series, usually with orange stripe; surfaces basally hirsute to villous, occasionally minutely glandular. |
in 2–4 series; surfaces moderately to densely strigose or villous, sometimes nearly glabrous distally, densely minutely glandular. |
Fruits | 2–3 mm, glabrous to sparsely strigose; inner pappi of numerous barbellate bristles. |
1–3 mm, sparsely strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–5+ in corymb-like arrays, radiate. |
1–5 in corymb-like arrays, radiate. |
2n | =18. |
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Erigeron speciosus |
Erigeron filifolius |
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Distribution | ||
Discussion | Conifer forests, moist slopes, riverbanks, wet meadows. Flowering Jun–Sep. 50–2500 m. BR, BW, CR, WV. ID, NV, WA; north to British Columbia, northeast to Alberta, east to NE, southeast to NM. Native. |
Rocky areas, sagebrush, juniper and pine forests. Flowering Apr–Aug. 50–2200 m. BR, BW, Col, ECas, Lava, Owy. CA, ID, NV, WA; north to British Columbia, northeast to MT, southeast to UT. Native. If subspecific taxa were recognized, Oregon specimens would correspond to the typical variety. |
Source | Flora of Oregon, volume 2 draft James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 256 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron speciosus var. macranthus, Erigeron speciosus var. speciosus, Erigeron subtrinervis | Erigeron filifolius var. filifolius, Erigeron filifolius var. robustior |
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