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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

rambling fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 3–10 cm; taprooted, caudices branching.
Stems

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

erect, nearly glabrous to remotely hirsute, 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, spatulate with 3–5 distal lobes, 6–25 × 3–10 mm;

margins entire;

surfaces moderately to densely hirsute.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

absent or reduced to linear bracts.

Involucres

4–7 × 9–15 mm.

5–7 × 10–13 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

25–40, white to lavender to purple;

rays 6–9 × 0.5–1.5 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; purplish to green, with yellow-orange medial stripe;

surfaces remotely hirsute to basally villous.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

2–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1, radiate.

2n

=18.

Erigeron oreganus

Erigeron vagus

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.

Rocky areas, slopes. Flowering Jun–Aug. 1500–3100 m. BW. CA, NV; southeast to CO. Native.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 262
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. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener
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