Erigeron oreganus |
Erigeron simplex |
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Gorge daisy, gorge fleabane, Oregon fleabane |
one-stem fleabane |
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Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants perennial, 3–15 cm; fibrous-rooted, rhizomatous, caudices branched or not. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
erect, sparsely to moderately villous, eglandular. |
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, 50–350 × 30–90 mm; margins entire, sometimes moderately ciliate; surfaces glabrous to glabrate. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
obovate to linear, abruptly reduced distally; surfaces usually hirsute. |
Involucres | 4–7 × 9–15 mm. |
3–7 × 8–16 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 mm. |
30–50+, lavender to purple; rays 5–10 × 0.6–2.2 mm. |
Disc florets | corollas 3–5 mm. |
2–3 mm. |
Phyllaries | in 2–3 series, pale green with dark green medial stripe; surfaces remotely hirsute, strongly stipitate-glandular. |
in 2 series; margins usually ragged; surfaces moderately to densely villous. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
1–2 mm, sparsely strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
1, radiate. |
Erigeron oreganus |
Erigeron simplex |
|
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. |
Rocky areas, meadows. Flowering Jul–Aug. 2400–3000 m. BW. ID, NV; northeast to MT, east to WY, southeast to CO, NM. Native. |
Source | Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 261 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron grandiflorus | |
Web links |