Erigeron oreganus |
Erigeron latus |
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Gorge daisy, gorge fleabane, Oregon fleabane |
broad fleabane, Owyhee fleabane |
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Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants perennial, 5–10 cm; taprooted, caudices branching. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
erect, sparsely to moderately hirsute, densely 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 to spatulate, 15–50 × 1.3–4.5 mm; margins entire; tips rounded to acute or acuminate; surfaces moderately to densely hirsute to nearly hispid, minutely glandular. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
few, similar to basal, usually abruptly reduced distally. |
Involucres | 4–7 × 9–15 mm. |
6–9 × 13–21 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 mm. |
20–35, lavender to purple; rays 6–11 × 1–2 mm. |
Disc florets | corollas 3–5 mm. |
4–5 mm. |
Phyllaries | in 2–3 series, pale green with dark green medial stripe; surfaces remotely hirsute, strongly stipitate-glandular. |
in 2–3 series, with dark medial area, sometimes with orange stripe; surfaces sparsely to moderately hispid-hirsute, densely minutely glandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
2–4 mm, glabrate to sparsely strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
1, radiate. |
Erigeron oreganus |
Erigeron latus |
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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. |
Open areas, sagebrush, streambanks. Flowering May–Jul. 1600–2000 m. Owy. ID, NV. Native. Erigeron latus and E. poliospermus are very similar with the exception of the vestiture of the fruits. Further research is needed to determine if continued recognition of two distinct species is warranted. |
Source | Flora of Oregon, volume 2, page 259 James Riser, Stephen Meyers |
Flora of Oregon, volume 2, page 258 James Riser, Stephen Meyers |
Sibling taxa | ||
Web links |