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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

Erigeron aliceae

Alice Eastwood's fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 30–70 cm; fibrous-rooted, rhizomatous, caudices sometimes branching.
Stems

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

erect, nearly glabrous or sparsely strigose often becoming more so distally, eglandular.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

usually persistent, lanceolate to oblanceolate, 50–120 × 10–30 mm;

margins entire, sometimes coarsely toothed with 1–5 pairs of teeth;

midveins prominent, rarely with 2 prominent veins;

surfaces remotely to moderately strigose.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

well developed, lanceolate to narrowly elliptic, 10–80 × 3–14 mm, distally reduced, bases clasping.

Involucres

4–7 × 9–15 mm.

5–7 × 13–17 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

30–80, white to lavender to purple;

rays 4–12 × 1–1.5 mm.

Disc florets

corollas 3–5 mm.

corollas 2–4 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 green medial area;

surfaces white woolly-villous, glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

2–3 mm, moderately to densely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1–few, radiate.

Erigeron oreganus

Erigeron aliceae

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, ridges, prairies. Flowering Jun–Sep. 400–2200 m. Casc, CR, ECas, Sisk. CA, WA. Native.

This is a variable species that can be confused with Erigeron glacialis. The woolly-villous phyllaries best distinguish E. aliceae from E. glacialis.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 252
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. 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, E. vagus
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