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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

foothill daisy, longleaf fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 15–40 cm; taprooted, often with slender, branching caudices.
Stems

decumbent to erect; hirsute with unequal hairs, sparsely glandular.

erect or ascending, moderately hirsute to villous, eglandular.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

usually persistent, linear to narrowly oblanceolate, 50–200 × 2–10 mm;

margins entire, 1–3 prominent veins;

tips usually acute;

surfaces moderately to densely strigose, eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

linear, 15–60 × 1–5 mm, gradually reduced distally.

Involucres

4–7 × 9–15 mm.

4–7 × 8–14 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

30–60, white to purple;

rays 2.5–14 × 1–1.5 mm.

Disc florets

corollas 3–5 mm.

corollas 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, usually with dark medial area;

surfaces moderately to densely hirsute to villous, occasionally glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

2–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1–5(10) in corymb-like arrays, radiate.

2n

=18.

Erigeron oreganus

Erigeron corymbosus

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
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 hillsides, sagebrush, pine forests. Flowering Jun–Aug. 200–2500 m. BR, BW, Casc, ECas, Lava, Owy. ID, WA; north to British Columbia, northeast to MT, east to WY, southeast to UT. 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
E. acris, E. aliceae, E. annuus, E. aphanactis, E. aureus, E. bloomeri, E. cascadensis, E. cervinus, E. chrysopsidis, E. compositus, E. corymbosus, E. coulteri, E. decumbens, E. disparipilus, E. divergens, E. eatonii, E. elegantulus, E. filifolius, E. foliosus, E. glacialis, E. glaucus, E. howellii, E. inornatus, E. karvinskianus, E. klamathensis, E. latus, E. linearis, E. lonchophyllus, E. nivalis, E. peregrinus, E. petrophilus, E. philadelphicus, E. poliospermus, E. pumilus, E. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
E. acris, E. aliceae, E. annuus, E. aphanactis, E. aureus, E. bloomeri, E. cascadensis, E. cervinus, E. chrysopsidis, E. compositus, E. coulteri, E. decumbens, E. disparipilus, E. divergens, E. eatonii, E. elegantulus, E. filifolius, E. foliosus, E. glacialis, E. glaucus, E. howellii, E. inornatus, E. karvinskianus, E. klamathensis, E. latus, E. linearis, E. lonchophyllus, E. nivalis, E. oreganus, E. peregrinus, E. petrophilus, E. philadelphicus, E. poliospermus, E. pumilus, E. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
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