UW Burke Herbarium species comparison

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Erigeron filifolius

Erigeron poliospermus

Peck's threadleaf fleabane

hairy-seeded daisy, 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. Taprooted perennial with short-branched, woody base; stems to 15 cm. high; plants more or less spreading-hairy and glandular throughout.
Leaves

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

Basal leaves linear-oblanceolate to spatulate, up to 8 cm. long and 12 mm. wide, the cauline leaves reduced.
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, hemispheric, the disk 9-20 mm. wide;

involucre 5-9 mm. high;

rays 15-45, pale pink or purple to deep violet, 4-15 mm. long and 1.3-3.6 mm. wide;

pappus of 20-30 capillary bristles.
Fruits

Achenes densely covered with long, silky hairs.

Erigeron filifolius

Erigeron poliospermus
Flowering time May-July April-June
Habitat Sagebrush plains, dry slopes, and grasslands. Dry, open, typically rocky areas, often with sagebrush.
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 Washington; British Columbia to Oregon, east to western Idaho.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Not of concern 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. 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. 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. oreganus, E. peregrinus, E. philadelphicus, E. piperianus, E. pumilus, E. salishii, E. speciosus, E. strigosus, E. subtrinervis
Subordinate taxa
E. poliospermus var. cereus, E. poliospermus var. poliospermus
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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