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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

short-rayed fleabane, spear-leaved fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants biennial or short-lived perennial, 4–33 cm; usually fibrous-rooted, caudices simple.
Stems

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

erect, sparsely to densely hirsute, eglandular or occasionally with densely minute glands.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

persistent, oblanceolate to spatulate, 10–100 × 4–10 mm;

margins entire, often with spreading cilia;

surfaces glabrous to moderately hirsute or strigose.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

narrowly elliptic, oblong, oblanceolate to linear, 10–100 × 1–5 mm, reduced distally, bases often clasping;

surfaces glabrous to moderately hirsute or strigose.

Involucres

4–7 × 9–15 mm.

4–7 × 5–11 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

40–100, white to pink;

rays 2–5 × 0.2–0.4 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 sparsely to densely hirsute, glandular or eglandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

1.5–2.5 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1–10 in raceme-like arrays, radiate.

2n

=18.

Erigeron oreganus

Erigeron lonchophyllus

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.

Floodplains, lakesides, gravel bars, roadsides, marshes, seeps. Flowering Jun–Aug. 800–2300 m. BR, BW, Casc, ECas, Lava, Owy. CA, ID, NV, WA; north to AK, northeast to Nunavut, east to Quebec, southeast to NM. 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. linearis, 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
Synonyms Trimorpha lonchophylla
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