UW Burke Herbarium species comparison

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Erigeron poliospermus

Erigeron caespitosus

hairy-seeded daisy, cushion fleabane

tufted fleabane
Habit Taprooted perennial with short-branched, woody base; stems to 15 cm. high; plants more or less spreading-hairy and glandular throughout. Herbaceous perennial from a stout taproot, the stems curved at the base, 5-30 cm. tall; herbage densely pubescent with short, spreading hairs.
Leaves

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

Basal leaves oblanceolate to spatulate, rounded or obtuse, triple-nerved;

cauline leaves linear to ovate-oblong.
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 solitary to several;

involucre 4-7 mm. high, imbricate, glandular and short grey-hairy, the bracts narrow and thickened on the back;

rays pistillate, 30-100, blue, white or pink, 5-15 mm. long;

disk flowers yellow;

pappus double, the outer short, the inner of 15-25 bristles.
Fruits

Achenes densely covered with long, silky hairs.

Achene

Erigeron poliospermus

Erigeron caespitosus
Flowering time April-June June-August
Habitat Dry, open, typically rocky areas, often with sagebrush. Dry, open, and often rocky places in sagebrush
Distribution
Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to western Idaho.
[WildflowerSearch map]
[BONAP county map]
Occurring east of the Cascades crest in Washington; Alaska to Washington, Idaho, Utah, and Arizona, east to the northern Great Plains.
[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. 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. 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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