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Erigeron oreganus

Gorge daisy, gorge fleabane, Oregon fleabane

Erigeron howellii

Howell's fleabane

Habit Plants perennial, 5–15 cm; taprooted, caudices unbranched. Plants perennial, 20–45 cm; fibrous-rooted, rhizomatous, caudices branching or not.
Stems

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

erect, glabrous to sparsely and minutely strigillose, eglandular.

Basal leaves

persistent, obovate, 15–90 × 5–20 mm;

margins coarsely serrate to shallowly lobulate;

surfaces sparsely to moderately hirsute to strigose.

persistent, broadly spatulate, 40–150 × 10–35 mm;

margins entire or with few large teeth;

surfaces glabrous, eglandular.

Cauline leaves

obovate to elliptic; little or not reduced distally;

surfaces sparsely to moderately hirsute.

lanceolate to elliptic, 15–80 × 10–35 mm, gradually reduced distally;

margins entire or with few coarse teeth;

surfaces often ciliate or glandular.

Involucres

4–7 × 9–15 mm.

5–9 × 15–23 mm.

Ray florets

30–60, pink to purple;

rays 4–5 × 0.5–1 mm.

25–50, white;

rays 8–20 × 2.5–4 mm.

Disc florets

corollas 3–5 mm.

corollas 4–5 mm.

Phyllaries

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

surfaces remotely hirsute, strongly stipitate-glandular.

in 2–3 series, with prominent central veins;

surfaces glabrous, densely glandular.

Fruits

2–3 mm, moderately strigose;

inner pappi of several unbarbed to weakly barbellate twisted bristles.

2.5–3 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–4, radiate.

1, radiate.

Erigeron oreganus

Erigeron howellii

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 slopes, open woods. Flowering May–Jul. 100–1500 m. Casc. WA. 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. 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
Web links