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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

one-stem fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 3–15 cm; fibrous-rooted, rhizomatous, caudices branched or not.
Stems

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

erect, sparsely to moderately villous, eglandular.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

persistent, oblanceolate to spatulate, 50–350 × 30–90 mm;

margins entire, sometimes moderately ciliate;

surfaces glabrous to glabrate.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

obovate to linear, abruptly reduced distally;

surfaces usually hirsute.

Involucres

4–7 × 9–15 mm.

3–7 × 8–16 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

30–50+, lavender to purple;

rays 5–10 × 0.6–2.2 mm.

Disc florets

corollas 3–5 mm.

2–3 mm.

Phyllaries

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

surfaces remotely hirsute, strongly stipitate-glandular.

in 2 series;

margins usually ragged;

surfaces moderately to densely villous.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

1–2 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1, radiate.

Erigeron oreganus

Erigeron simplex

Distribution
[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.

Rocky areas, meadows. Flowering Jul–Aug. 2400–3000 m. BW. ID, NV; northeast to MT, east to WY, southeast to CO, NM. Native.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 261
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. 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. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
Synonyms Erigeron grandiflorus
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