Erigeron oreganus |
Erigeron philadelphicus |
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Gorge daisy, gorge fleabane, Oregon fleabane |
Philadelphia fleabane |
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Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants annual, biennial, or short-lived perennial, 10–80 cm; roots fibrous, caudices usually simple. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
erect, sparsely to moderately hirsute to lanate, minutely glandular. |
Basal leaves | persistent, obovate, 15–90 × 5–20 mm; margins coarsely serrate to shallowly lobulate; surfaces sparsely to moderately hirsute to strigose. |
withering by flowering, oblanceolate to nearly spatulate, 20–170 × 5–35 mm; margins nearly entire, coarsely serrate, lobulate, or shallowly dentate; surfaces slightly to moderately strigose or hirsute, eglandular. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
oblanceolate to lanceolate to elliptic or oblong, 5–130 × 3–25 mm, distally reduced, bases clasping; surfaces eglandular. |
Involucres | 4–7 × 9–15 mm. |
3–6 × 6–15 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 mm. |
150–250, white to pink; rays 2–7 × 0.2–0.5 mm. |
Disc florets | corollas 3–5 mm. |
corollas 2–3 mm. |
Phyllaries | in 2–3 series, pale green with dark green medial stripe; surfaces remotely hirsute, strongly stipitate-glandular. |
in 2–3 series; surfaces sparsely to moderately hirsute, minutely glandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
1–1.5 mm, sparsely to moderately strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
(1)3–many in corymb-like arrays, radiate. |
2n | =18. |
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Erigeron oreganus |
Erigeron philadelphicus |
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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. |
Disturbed areas, streambanks, fields, meadows, forest openings. Flowering Apr–Sep. 0–1900 m. All ecoregions. CA, ID, NV, WA; nearly worldwide. Native. |
Source | Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 260 James Riser, Stephen Meyers |
Sibling taxa | ||
Synonyms | Erigeron philadelphicus var. philadelphicus | |
Web links |