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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

diffuse daisy, spreading fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants annual or short-lived perennial, 12–50+ cm; taprooted, with short, branching caudices.
Stems

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

erect, ascending to decumbent, densely pilose to sparsely hirsute, minutely glandular at least distally.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

persistent or withering by flowering, spatulate, 20–80 × 5–10 mm;

margins entire or with 1–2 coarse teeth;

surfaces moderately to densely strigose, usually eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

numerous and well developed, elliptic, obovate, or linear, 5–30 × 1–4 mm, usually slightly reduced distally;

surfaces densely strigose to villous.

Involucres

4–7 × 9–15 mm.

2–4 × 6–10 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

75–150, light purple to lavender;

rays 2–5 × 0.25–0.6 mm.

Disc florets

corollas 3–5 mm.

corollas 2–3 mm.

Phyllaries

in 2–3 series, pale green with dark green medial stripe;

surfaces remotely hirsute, strongly stipitate-glandular.

in 2–3 series, usually with dark green or brown medial area and lighter colored stripe;

surfaces moderately to densely hirsute or strigose, moderately to densely glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

0.75–1 mm, glabrous to very sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1–20+ in corymb-like arrays, radiate.

2n

=18, 27, 36.

Erigeron oreganus

Erigeron divergens

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.

Dry open areas, roadsides, streambanks. Flowering May–Sep. 50–2200 m. BR, BW, Casc, Col, ECas, Est, Lava. CA, ID, WA; north to British Columbia, northeast to Alberta, east to SD, southeast to TX, south to Mexico. 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. coulteri, E. decumbens, E. disparipilus, 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
Synonyms Erigeron divergens var. divergens
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