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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

seaside daisy, seaside fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 3–30 cm; fibrous-rooted, rhizomatous, caudices usually simple, occasionally branching.
Stems

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

decumbent, procumbent or ascending, sparsely to moderately hirsute, usually 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, obovate to broadly spatulate, 15–40 × 5–25 mm;

margins entire;

surfaces usually glabrous and eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

similar to basal, 7–30 × 3–15 mm, gradually reduced distally.

Involucres

4–7 × 9–15 mm.

5–10 × 10–21 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

70–100, lavender to purple;

rays 6–9 × 1–2 mm.

Disc florets

corollas 3–5 mm.

corollas 4–6 mm.

Phyllaries

in 2–3 series, pale green with dark green medial stripe;

surfaces remotely hirsute, strongly stipitate-glandular.

in 3–4 series;

surfaces moderately to densely villous, sparsely to moderately glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

2–3 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1(3), radiate.

2n

=18.

Erigeron oreganus

Erigeron glaucus

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.

Coastal dunes, bluffs. Flowering May–Aug. 0–500 m. Est. CA. Native.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 257
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. corymbosus, E. coulteri, E. decumbens, E. disparipilus, E. divergens, E. eatonii, E. elegantulus, E. filifolius, E. foliosus, E. glacialis, 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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