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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

Siskiyou daisy, Siskiyou fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 10–45 cm; fibrous-rooted, rhizomatous, occasionally with branching caudices.
Stems

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

erect or ascending, glabrous and mostly 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 obovate, 10–100 × 5–15 mm;

margins entire;

surfaces glabrous, eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

oblanceolate to elliptic, 10–50 × 2–10 mm, gradually reduced distally.

Involucres

4–7 × 9–15 mm.

4–6 × 10–13 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

20–40;

corollas white to purple;

rays 3–7 × 0.5–1.5 mm.

Disc florets

corollas 3–5 mm.

corollas 3–5 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 glabrous, densely glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

1.5–2 mm, moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1–4 in loose corymb-like arrays, radiate.

Erigeron oreganus

Erigeron cervinus

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.

Streamsides, river bars, wet rocky banks, moist seeps. Flowering May–Aug. 0–1700 m. Sisk. CA. Native.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 253
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. 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. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
Synonyms Erigeron delicatus
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