OregonFlora species comparison

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Erigeron poliospermus

Erigeron decumbens

hairy-seeded daisy, purple-cushion fleabane

Willamette fleabane, Willamette Valley daisy
Habit Plants perennial, 15–55 cm; taprooted, with upright, branching caudices.
Stems

few to many; erect or decumbent, remotely to moderately strigillose, eglandular.
Basal leaves

usually withering by flowering, linear to narrowly oblanceolate, 30–120 × 3–5 mm;

margins entire;

surfaces sparsely strigillose to minutely strigose, eglandular.
Cauline leaves

linear to narrowly oblanceolate, 10–100 × 1–3 mm, gradually reduced distally;

margins entire, usually 3-veined;

surfaces lightly to moderately strigose.
Involucres

3–5 × 7–15 mm.
Ray florets

25–50, white to lavender;

rays 5–8(12) × 1–2 mm.
Disc florets

corollas 3–4 mm.
Phyllaries

in 2–3 series, usually with dark medial area, moderately to densely hirsute or strigose, eglandular.
Fruits

1–2 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.
Heads

1–5 in corymb-like arrays, radiate.

Erigeron poliospermus

Erigeron decumbens
Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Prairies. Flowering May–Jul. 50–300 m. WV. Native. Endemic to Oregon.

Erigeron decumbens is federally listed as an endangered species. It is an Oregon endemic known only from scattered prairie remnants in the Willamette Valley where it inhabits seasonally flooded bottomland prairies as well as well-drained upland prairies. It has likely been extirpated from parts of its former range in Clackamas, Washington, and Yamhill counties.
Source Flora of Oregon, volume 2, page 255
James Riser, Stephen Meyers
Sibling taxa
E. acris, E. aliceae, E. annuus, E. aphanactis, E. aureus, E. bloomeri, E. cascadensis, E. cervinus, E. chrysopsidis, E. compositus, E. corymbosus, E. coulteri, E. decumbens, E. disparipilus, E. divergens, E. eatonii, E. elegantulus, E. filifolius, E. foliosus, E. glacialis, E. glaucus, E. howellii, E. inornatus, E. karvinskianus, E. klamathensis, E. latus, E. linearis, E. lonchophyllus, E. nivalis, E. oreganus, E. peregrinus, E. petrophilus, E. philadelphicus, E. pumilus, E. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
E. acris, E. aliceae, E. annuus, E. aphanactis, E. aureus, E. bloomeri, E. cascadensis, E. cervinus, E. chrysopsidis, E. compositus, E. corymbosus, E. coulteri, E. disparipilus, E. divergens, E. eatonii, E. elegantulus, E. filifolius, E. foliosus, E. glacialis, E. glaucus, E. howellii, E. inornatus, E. karvinskianus, E. klamathensis, E. latus, E. linearis, E. lonchophyllus, E. nivalis, E. oreganus, E. peregrinus, E. petrophilus, E. philadelphicus, E. poliospermus, E. pumilus, E. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
Subordinate taxa
E. poliospermus var. poliospermus
Synonyms Erigeron decumbens ssp. decumbens, Erigeron decumbens var. decumbens
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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