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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

peregrine fleabane, subalpine fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 20–50 cm; fibrous-rooted, often rhizomatous, caudices usually simple.
Stems

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

erect, nearly glabrous, or sparsely hirsute proximally to densely strigillose or pilose distally, eglandular.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

persistent, linear-oblanceolate to broadly oblanceolate, 30–150 × 8–30 mm;

margins entire;

surfaces glabrous, eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

lanceolate to oblanceolate, 10–80 × 3–30 cm, reduced distally, bases occasionally clasping;

surfaces glabrous.

Involucres

4–7 × 9–15 mm.

5–8 × 12–15 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

30–60, lavender to purple;

rays 5–9 × 1.5–4 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 2–3 series, with dark medial area, glabrous, densely glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

2–4 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1(4), radiate.

Erigeron oreganus

Erigeron glacialis var. glacialis

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.

Meadows, streamsides, lakeshores, bogs. Flowering Jun–Sep. 800–3200 m. BR, BW, Casc, CR, ECas. CA, ID, NV, WA; north to AK, northeast to Alberta, east to WY, southeast to NM. Native.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2 draft
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. glacialis var. glacialis
Synonyms Erigeron peregrinus ssp. callianthemus, Erigeron peregrinus var. angustifolius, Erigeron peregrinus var. callianthemus, Erigeron peregrinus var. eucallianthemus, Erigeron peregrinus var. scaposus, Erigeron ursinus
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