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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

dwarf yellow fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 3–20 cm; taprooted, usually with many woody, branching caudices.
Stems

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

erect; hirsute, eglandular to 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 in dense clusters, linear to narrowly oblanceolate, 10–80 × 1–3 mm;

margins entire with hispid hairs;

surfaces hirsute to hispid, sometimes nearing strigose.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

abruptly reduced to (0)1–3 linear bracts.

Involucres

4–7 × 9–15 mm.

4–7 × 10–16 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

20–60;

corollas with well-developed yellow rays, 4–8 × 0.5–2 mm, or tubular and short, or rays lacking.

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, sparsely to moderately hispid-villous, often minutely glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

2–3 mm, moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1, radiate or disciform.

Erigeron oreganus

Erigeron chrysopsidis

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.

Western United States. 3 varieties.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 254
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. 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
Subordinate taxa
E. chrysopsidis var. austiniae, E. chrysopsidis var. brevifolius, E. chrysopsidis var. chrysopsidis
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