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dwarf yellow fleabane

Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

Habit Plants perennial, 3–20 cm; taprooted, usually with many woody, branching caudices. Plants perennial, 5–15 cm; taprooted, caudices unbranched.
Stems

erect; hirsute, eglandular to minutely glandular.

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

Basal leaves

persistent in dense clusters, linear to narrowly oblanceolate, 10–80 × 1–3 mm;

margins entire with hispid hairs;

surfaces hirsute to hispid, sometimes nearing strigose.

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

Cauline leaves

abruptly reduced to (0)1–3 linear bracts.

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

Involucres

4–7 × 10–16 mm.

4–7 × 9–15 mm.

Ray florets

20–60;

corollas with well-developed yellow rays, 4–8 × 0.5–2 mm, or tubular and short, or rays lacking.

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

Disc florets

corollas 4–5 mm.

corollas 3–5 mm.

Phyllaries

in 2–3 series, sparsely to moderately hispid-villous, often minutely glandular.

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

surfaces remotely hirsute, strongly stipitate-glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of numerous barbellate bristles.

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

Heads

1, radiate or disciform.

1–4, radiate.

Erigeron chrysopsidis

Erigeron oreganus

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Western United States. 3 varieties.

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.

Source Flora of Oregon, volume 2, page 254
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 259
James Riser, Stephen Meyers
Sibling taxa
E. acris, E. aliceae, E. annuus, E. aphanactis, E. aureus, E. bloomeri, E. cascadensis, E. cervinus, 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
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
Subordinate taxa
E. chrysopsidis var. austiniae, E. chrysopsidis var. brevifolius, E. chrysopsidis var. chrysopsidis
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