Erigeron oreganus |
Erigeron decumbens |
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Gorge daisy, gorge fleabane, Oregon fleabane |
Willamette fleabane, Willamette Valley daisy |
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Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants perennial, 15–55 cm; taprooted, with upright, branching caudices. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
few to many; erect or decumbent, remotely to moderately strigillose, eglandular. |
Basal leaves | persistent, obovate, 15–90 × 5–20 mm; margins coarsely serrate to shallowly lobulate; surfaces sparsely to moderately hirsute to strigose. |
usually withering by flowering, linear to narrowly oblanceolate, 30–120 × 3–5 mm; margins entire; surfaces sparsely strigillose to minutely strigose, eglandular. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
linear to narrowly oblanceolate, 10–100 × 1–3 mm, gradually reduced distally; margins entire, usually 3-veined; surfaces lightly to moderately strigose. |
Involucres | 4–7 × 9–15 mm. |
3–5 × 7–15 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 mm. |
25–50, white to lavender; rays 5–8(12) × 1–2 mm. |
Disc florets | corollas 3–5 mm. |
corollas 3–4 mm. |
Phyllaries | in 2–3 series, pale green with dark green medial stripe; surfaces remotely hirsute, strongly stipitate-glandular. |
in 2–3 series, usually with dark medial area, moderately to densely hirsute or strigose, eglandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
1–2 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
1–5 in corymb-like arrays, radiate. |
Erigeron oreganus |
Erigeron decumbens |
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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. |
Prairies. Flowering May–Jul. 50–300 m. WV. Native. Endemic to Oregon. Erigeron decumbens is federally listed as an endangered species. It is an Oregon endemic known only from scattered prairie remnants in the Willamette Valley where it inhabits seasonally flooded bottomland prairies as well as well-drained upland prairies. It has likely been extirpated from parts of its former range in Clackamas, Washington, and Yamhill counties. |
Source | Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 255 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron decumbens ssp. decumbens, Erigeron decumbens var. decumbens | |
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