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Erigeron oreganus

Gorge fleabane, Oregon fleabane

Peck's threadleaf fleabane

Habit Perennial from a stout, woody base and root, the lax stem 5-15 cm. long, covered with glands and loose, sticky hairs. Perennial from a taproot and branched, short woody base, 1-5 dm. tall, the stem densely covered with fine, appressed hairs aligned in one direction.
Leaves

Basal leaves tufted, spatulate to obovate, coarsely toothed or incised, up to 9 cm. long and 2.5 cm. wide;

cauline leaves well developed, broadly lanceolate to ovate or elliptic, up to 4 cm. long and 1 cm. wide.

Leaves both basal and cauline, linear or linear-filiform, 1-8 cm. long and 0.3-3 mm. wide, of uniform width.

Flowers

Heads 1-several in a leafy inflorescence, the disk 9-13 mm. wide;

involucre 5-7 mm. high, the bracts loose, equal, thin and green;

rays 30-60, pink or white to bluish; disk corollas 3.4-4.7 mm. long, yellow;

pappus simple, of 15-20 bristles that are curled and twisted above.

Heads solitary or several;

involucre 4-6 mm. high, with fine, soft hairs or small glands or both;

rays 15-125, blue, pink or white, 3-13 mm. long and 1-2 mm. wide;

pappus of 20-30 simple hairs.

Erigeron oreganus

Erigeron filifolius

Flowering time May-September May-July
Habitat Moist shady cliffs and ledges. Sagebrush plains, dry slopes, and grasslands.
Distribution
Occurring in the Columbia River Gorge in Washington; Columbia River Gorge in Washington to adjacent Gorge area in Oregon.
[WildflowerSearch map]
[BONAP county map]
Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Montana, Idaho, and Utah.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Threatened in Washington (WANHP) Not of concern
Sibling taxa
E. acris, E. aliceae, E. annuus, E. aureus, E. basalticus, E. bloomeri, E. caespitosus, E. chrysopsidis, E. compositus, E. corymbosus, E. davisii, E. disparipilus, E. divergens, E. eatonii, E. elatus, E. filifolius, E. flettii, E. glacialis, E. howellii, E. inornatus, E. karvinskianus, E. leibergii, E. linearis, E. lonchophyllus, E. nivalis, E. peregrinus, E. philadelphicus, E. piperianus, E. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus, E. subtrinervis
E. acris, E. aliceae, E. annuus, E. aureus, E. basalticus, E. bloomeri, E. caespitosus, E. chrysopsidis, E. compositus, E. corymbosus, E. davisii, E. disparipilus, E. divergens, E. eatonii, E. elatus, E. flettii, E. glacialis, E. howellii, E. inornatus, E. karvinskianus, E. leibergii, E. linearis, E. lonchophyllus, E. nivalis, E. oreganus, E. peregrinus, E. philadelphicus, E. piperianus, E. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus, E. subtrinervis
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