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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

desert yellow fleabane, lineleaf fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 7–20 cm; taprooted, caudices branching.
Stems

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

erect or basally ascending, moderately to densely strigose, eglandular.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

persistent, linear to very narrowly oblanceolate, 15–80 × 0.5–2 mm, bases sheathing and light- or white-colored;

margins entire;

surfaces moderately to densely strigose, eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

linear, 5–20 × 0.5–1 mm, usually reduced distally, bases sheathing.

Involucres

4–7 × 9–15 mm.

5–8 × 9–13 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

20–40, bright yellow;

rays 5–7 × 1–2 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 strigose; hirsute, or manicate, minutely glandular.

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(2), radiate.

2n

=18, 27, 36, 45.

Erigeron oreganus

Erigeron linearis

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, sagebrush, juniper forests. Flowering May–Jul. 200–2500 m. BR, BW, Col, ECas, Lava, Owy. CA, ID, NV, WA; north to British Columbia, northeast to MT, east to WY, southeast to UT. Native.

Source Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 258
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. 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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