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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

Coulter's fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 15–55 cm; roots fibrous, rhizomatous, occasionally with branching caudices.
Stems

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

erect, sparsely villous, eglandular.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

occasionally withering by flowering, broadly oblanceolate-elliptic, 40–150 × 10–25 mm;

margins entire or occasionally with poorly developed teeth;

surfaces sparsely strigose or hirsute, eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

lanceolate to elliptic, 10–80 × 2.5–25(30) mm, gradually reduced distally, bases clasping;

margins entire or with minute teeth.

Involucres

4–7 × 9–15 mm.

5–8 × 11–17 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

60–110, white;

rays 8–15 × 0.5–1 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;

surfaces moderately to densely hirsute or villous, eglandular to minutely glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

1.5–2 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1(3), radiate.

2n

=18.

Erigeron oreganus

Erigeron coulteri

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.

Moist coniferous forests, wet meadows. Flowering Jun–Aug. 1100–2000 m. BW. CA, ID, NV; northeast to MT, east to WY, southeast to NM. Native.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 255
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. 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
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