UW Burke Herbarium species comparison

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Erigeron poliospermus

Erigeron subtrinervis

hairy-seeded daisy, cushion fleabane

three-veined fleabane
Habit Taprooted perennial with short-branched, woody base; stems to 15 cm. high; plants more or less spreading-hairy and glandular throughout. Perennial from a short, woody base, 1.5-8 dm. tall, the stems clustered, amply leafy, spreading-hairy throughout.
Leaves

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

Leaves triple-nerved, entire, the lower oblanceolate or spatulate, petiolate, mostly deciduous, the other becoming sessile but ample.
Flowers

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.

Heads 1-13 in a open inflorescence;

involucre 6-9 mm. high;

rays 65-150, blue or rarely white or pink, 9-18 mm. long and 1 mm. wide;

pappus 20-30 bristles, a few of the outer ones shorter.
Fruits

Achenes densely covered with long, silky hairs.

Erigeron poliospermus

Erigeron subtrinervis
Flowering time April-June July-September
Habitat Dry, open, typically rocky areas, often with sagebrush. Moderately dry, open places at low to middle elevations.
Distribution
Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to western Idaho.
[WildflowerSearch map]
[BONAP county map]
Occurring on both sides of the Cascades crest in Washington; British Columbia to Washington, east to the Rocky Mountains.
[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. 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
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. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus
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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