Erigeron oreganus |
Erigeron nivalis |
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Gorge daisy, gorge fleabane, Oregon fleabane |
northern daisy |
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Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants biennial or short-lived perennial, 4–20 cm; fibrous-rooted to weakly taprooted, caudices branched. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
erect, sparsely to moderately hirsute, minutely glandular. |
Basal leaves | persistent, obovate, 15–90 × 5–20 mm; margins coarsely serrate to shallowly lobulate; surfaces sparsely to moderately hirsute to strigose. |
persistent, oblanceolate to spatulate, 10–100 × 3–15 mm; margins entire, ciliate; surfaces glabrous to sparsely strigose. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
oblanceolate, elliptic, or lanceolate, 5–50 × 1–5 mm, reduced distally; surfaces glabrous or sparsely strigose. |
Involucres | 4–7 × 9–15 mm. |
4–7 × 7–13 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 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 3–5 mm. |
corollas 4–6 mm. |
Phyllaries | in 2–3 series, pale green with dark green medial stripe; surfaces remotely hirsute, strongly stipitate-glandular. |
in 2–3 series; surfaces nearly glabrous to sparsely hirsute, occasionally villous basally, densely glandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
1.5–2.5 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
1–10 in corymb-like arrays, radiate. |
2n | =18. |
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Erigeron oreganus |
Erigeron nivalis |
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Distribution | ||
Discussion | Shady cliffs, rocky slopes, crevices. Flowering May–Aug. 100–400 m. Casc. WA. Native. This uncommon species is found only in the Columbia River Gorge. |
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 259 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron acris var. debilis, Trimorpha acris var. debilis | |
Web links |
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