UW Burke Herbarium species comparison

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Erigeron filifolius

Erigeron acris

Peck's threadleaf fleabane

bitter 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. Biennial or perennial, 0.5-8 dm. tall, often covered with stiff, blunt hairs.
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 oblanceolate or spatulate, the cauline ones ample to strongly reduced, lance-ovate to linear-oblong;
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 usually several on somewhat glandular, curved peduncles;

involucral bracts tapered and pointed;

rays pistillate, numerous, erect, inconspicuous, white, up to 4 mm. long and 0.4 mm. wide; inner pistillate flowers rayless;

pappus surpassing the disk flowers.

Erigeron filifolius

Erigeron acris
Flowering time May-July June-September
Habitat Sagebrush plains, dry slopes, and grasslands. Meadows, forest openings, and open slopes from middle elevations to the subalpine.
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 on both sides of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains, Great Lakes region, and northeastern North America; circumboreal.
[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. 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. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus, E. subtrinervis
Subordinate taxa
E. acris var. kamtschaticus
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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