UW Burke Herbarium species comparison

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Erigeron filifolius

Erigeron disparipilus

Peck's threadleaf fleabane
Erigeron disparipilus

Snake River fleabane, white cushion fleabane
Habit 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. Perennial from a tap-root, 3-12 cm. high, the stem covered with very unequal, spreading hairs.
Leaves

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

Leaves nearly all in a basal cluster, finely stiff-hairy, linear or linear-oblanceolate, up to 4 cm. long and 2 mm. wide.
Flowers

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.

Heads solitary;

involucres 5-7 mm. high, with spreading short hairs and often glandular as well;

rays 30-60, white, pistillate, becoming pinkish, 5-10 mm. long and 1.5-2.3 mm. wide;

disk flowers yellow;

pappus of 15-25 capillary bristles.

Erigeron filifolius

Erigeron disparipilus
Flowering time May-July May-July
Habitat Sagebrush plains, dry slopes, and grasslands. Dry, rocky hillsides at low to middle elevations.
Distribution
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]
Occurring east of the Cascades crest in the Snake River area in southeastern Washington; southeastern Washington to southeastern Oregon, east to southwestern Idaho.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Not of concern Sensitive in Washington (WANHP)
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. 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
E. acris, E. aliceae, E. annuus, E. aureus, E. basalticus, E. bloomeri, E. caespitosus, E. chrysopsidis, E. compositus, E. corymbosus, E. davisii, 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. oreganus, E. peregrinus, E. philadelphicus, E. piperianus, E. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus, E. subtrinervis
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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