Erigeron oreganus |
Erigeron tener |
|
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Gorge daisy, gorge fleabane, Oregon fleabane |
slender fleabane |
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Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants perennial, 3–15 cm; taprooted, caudices branching. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
erect, sparsely strigose, sometimes 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, narrowly oblanceolate-elliptic to spatulate, 5–50 × 1–4 mm; margins entire; tips acute; surfaces densely strigose. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
few, linear, 5–20 × ~1 mm, abruptly reduced distally. |
Involucres | 4–7 × 9–15 mm. |
3–5 × 7–11 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 mm. |
15–24, blue to purple; rays 3–6 × 0.5–1 mm. |
Disc florets | corollas 3–5 mm. |
corollas 2–4 mm. |
Phyllaries | in 2–3 series, pale green with dark green medial stripe; surfaces remotely hirsute, strongly stipitate-glandular. |
medial areas usually purple; surfaces glabrous to moderately hirsute, densely glandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
1–3 mm, sparsely strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
1(3), radiate. |
Erigeron oreganus |
Erigeron tener |
|
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, talus, slops, crevices. Flowering May–Aug. 1700–2500 m. BR. CA, ID, NV; northeast to MT, east to WY, southeast to AZ. Native. In Oregon, Erigeron tener is thus far known only from Steens Mountain. |
Source | Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 262 James Riser, Stephen Meyers |
Sibling taxa | ||
Web links |