Erigeron oreganus |
Erigeron divergens |
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Gorge daisy, gorge fleabane, Oregon fleabane |
diffuse daisy, spreading fleabane |
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Habit | Plants perennial, 5–15 cm; taprooted, caudices unbranched. | Plants annual or short-lived perennial, 12–50+ cm; taprooted, with short, branching caudices. |
Stems | decumbent to erect; hirsute with unequal hairs, sparsely glandular. |
erect, ascending to decumbent, densely pilose to sparsely hirsute, minutely glandular at least distally. |
Basal leaves | persistent, obovate, 15–90 × 5–20 mm; margins coarsely serrate to shallowly lobulate; surfaces sparsely to moderately hirsute to strigose. |
persistent or withering by flowering, spatulate, 20–80 × 5–10 mm; margins entire or with 1–2 coarse teeth; surfaces moderately to densely strigose, usually eglandular. |
Cauline leaves | obovate to elliptic; little or not reduced distally; surfaces sparsely to moderately hirsute. |
numerous and well developed, elliptic, obovate, or linear, 5–30 × 1–4 mm, usually slightly reduced distally; surfaces densely strigose to villous. |
Involucres | 4–7 × 9–15 mm. |
2–4 × 6–10 mm. |
Ray florets | 30–60, pink to purple; rays 4–5 × 0.5–1 mm. |
75–150, light purple to lavender; rays 2–5 × 0.25–0.6 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, usually with dark green or brown medial area and lighter colored stripe; surfaces moderately to densely hirsute or strigose, moderately to densely glandular. |
Fruits | 2–3 mm, moderately strigose; inner pappi of several unbarbed to weakly barbellate twisted bristles. |
0.75–1 mm, glabrous to very sparsely strigose; inner pappi of numerous barbellate bristles. |
Heads | 1–4, radiate. |
1–20+ in corymb-like arrays, radiate. |
2n | =18, 27, 36. |
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Erigeron oreganus |
Erigeron divergens |
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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. |
Dry open areas, roadsides, streambanks. Flowering May–Sep. 50–2200 m. BR, BW, Casc, Col, ECas, Est, Lava. CA, ID, WA; north to British Columbia, northeast to Alberta, east to SD, southeast to TX, south to Mexico. Native. |
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 divergens var. divergens | |
Web links |
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