Erigeron filifolius |
Erigeron nivalis |
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threadleaf fleabane |
northern daisy |
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Habit | Plants perennial, 9–40 cm; taprooted, with branching caudices. | Plants biennial or short-lived perennial, 4–20 cm; fibrous-rooted to weakly taprooted, caudices branched. |
Stems | erect, moderately to densely strigose, eglandular. |
erect, sparsely to moderately hirsute, 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, oblanceolate to spatulate, 10–100 × 3–15 mm; margins entire, ciliate; surfaces glabrous to sparsely strigose. |
Cauline leaves | gradually reduced distally or not. |
oblanceolate, elliptic, or lanceolate, 5–50 × 1–5 mm, reduced distally; surfaces glabrous or sparsely strigose. |
Involucres | 4–6 × 7–11 mm. |
4–7 × 7–13 mm. |
Ray florets | 20–40, white to purple; rays 3–9 × 0.7–1.5 mm. |
in 2 series, outer of 30–70 erect, filiform rays, 0.3–0.5 × 3–6 mm, white to light pink, inner of tubular florets; fewer than outer series. |
Disc florets | corollas 2–4 mm. |
corollas 4–6 mm. |
Phyllaries | in 2–4 series; surfaces moderately to densely strigose or villous, sometimes nearly glabrous distally, densely minutely glandular. |
in 2–3 series; surfaces nearly glabrous to sparsely hirsute, occasionally villous basally, densely glandular. |
Fruits | 1–3 mm, sparsely strigose; inner pappi of numerous barbellate bristles. |
1.5–2.5 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–5 in corymb-like arrays, radiate. |
1–10 in corymb-like arrays, radiate. |
2n | =18. |
=18. |
Erigeron filifolius |
Erigeron nivalis |
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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. |
Gravelly areas, mossy rocks, lava beds, talus slopes, cliffs. Flowering May–Aug. 1500–2500 m. BW, Casc, ECas. CA, ID, WA; north to AK, northeast to Northwest Territories, east to WY, southeast to NM. Native. |
Source | Flora of Oregon, volume 2, page 256 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron filifolius var. filifolius, Erigeron filifolius var. robustior | Erigeron acris var. debilis, Trimorpha acris var. debilis |
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