Erigeron filifolius |
Erigeron aliceae |
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threadleaf fleabane |
Alice Eastwood's fleabane |
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Habit | Plants perennial, 9–40 cm; taprooted, with branching caudices. | Plants perennial, 30–70 cm; fibrous-rooted, rhizomatous, caudices sometimes branching. |
Stems | erect, moderately to densely strigose, eglandular. |
erect, nearly glabrous or sparsely strigose often becoming more so distally, eglandular. |
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. |
usually persistent, lanceolate to oblanceolate, 50–120 × 10–30 mm; margins entire, sometimes coarsely toothed with 1–5 pairs of teeth; midveins prominent, rarely with 2 prominent veins; surfaces remotely to moderately strigose. |
Cauline leaves | gradually reduced distally or not. |
well developed, lanceolate to narrowly elliptic, 10–80 × 3–14 mm, distally reduced, bases clasping. |
Involucres | 4–6 × 7–11 mm. |
5–7 × 13–17 mm. |
Ray florets | 20–40, white to purple; rays 3–9 × 0.7–1.5 mm. |
30–80, white to lavender to purple; rays 4–12 × 1–1.5 mm. |
Disc florets | corollas 2–4 mm. |
corollas 2–4 mm. |
Phyllaries | in 2–4 series; surfaces moderately to densely strigose or villous, sometimes nearly glabrous distally, densely minutely glandular. |
in 2–3 series, with dark green medial area; surfaces white woolly-villous, glandular. |
Fruits | 1–3 mm, sparsely strigose; inner pappi of numerous barbellate bristles. |
2–3 mm, moderately to densely strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–5 in corymb-like arrays, radiate. |
1–few, radiate. |
2n | =18. |
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Erigeron filifolius |
Erigeron aliceae |
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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. |
Meadows, ridges, prairies. Flowering Jun–Sep. 400–2200 m. Casc, CR, ECas, Sisk. CA, WA. Native. This is a variable species that can be confused with Erigeron glacialis. The woolly-villous phyllaries best distinguish E. aliceae from E. glacialis. |
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 | |
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