Erigeron filifolius |
Erigeron aureus |
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threadleaf fleabane |
golden fleabane |
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Habit | Plants perennial, 9–40 cm; taprooted, with branching caudices. | Plants perennial, 5–10 cm; fibrous-rooted, with short, usually unbranched caudices. |
Stems | erect, moderately to densely strigose, eglandular. |
erect; hirsute to villous, minutely glandular. |
Basal leaves | persistent, linear to filiform, 20–80 × 0.5–2 mm; margins entire; tips rounded to acute or acuminate; surfaces moderately to densely strigose. |
persistent, spatulate to oblanceolate, 10–50 × 5–10 mm; margins entire; surfaces moderately to densely strigose, eglandular to minutely glandular. |
Cauline leaves | gradually reduced distally or not. |
5–10 × 1–5 mm abruptly reduced, often a single linear bract. |
Involucres | 4–6 × 7–11 mm. |
4–6 × 10–15 mm. |
Ray florets | 20–40, white to purple; rays 3–9 × 0.7–1.5 mm. |
40–60, bright yellow; rays 4–6 × 0.5–1.5 mm. |
Disc florets | corollas 2–4 mm. |
corollas 3–4 mm. |
Phyllaries | in 2–4 series; surfaces moderately to densely strigose or villous, sometimes nearly glabrous distally, densely minutely glandular. |
in 2–3 series, often purplish colored; surfaces moderately to densely woolly-villous, sparsely glandular. |
Fruits | 1–3 mm, sparsely strigose; inner pappi of numerous barbellate bristles. |
2–3 mm, moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–5 in corymb-like arrays, radiate. |
1, radiate. |
2n | =18. |
=18. |
Erigeron filifolius |
Erigeron aureus |
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Distribution | ||
Discussion | 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. |
Ridges, talus, rocky slopes. Flowering Jul–Aug. 1600–2600 m. BW. WA; north to British Columbia, northeast to Alberta. Native. In Oregon, this native species is currently known only from a single collection in the Eagle Cap Wilderness, Wallowa Mountains. |
Source | Flora of Oregon, volume 2, page 256 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 252 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron filifolius var. filifolius, Erigeron filifolius var. robustior | |
Web links |
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