OregonFlora species comparison

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Erigeron poliospermus

Erigeron divergens

hairy-seeded daisy, purple-cushion fleabane

diffuse daisy, spreading fleabane
Habit Plants annual or short-lived perennial, 12–50+ cm; taprooted, with short, branching caudices.
Stems

erect, ascending to decumbent, densely pilose to sparsely hirsute, minutely glandular at least distally.
Basal leaves

persistent or withering by flowering, spatulate, 20–80 × 5–10 mm;

margins entire or with 1–2 coarse teeth;

surfaces moderately to densely strigose, usually eglandular.
Cauline leaves

numerous and well developed, elliptic, obovate, or linear, 5–30 × 1–4 mm, usually slightly reduced distally;

surfaces densely strigose to villous.
Involucres

2–4 × 6–10 mm.
Ray florets

75–150, light purple to lavender;

rays 2–5 × 0.25–0.6 mm.
Disc florets

corollas 2–3 mm.
Phyllaries

in 2–3 series, usually with dark green or brown medial area and lighter colored stripe;

surfaces moderately to densely hirsute or strigose, moderately to densely glandular.
Fruits

0.75–1 mm, glabrous to very sparsely strigose;

inner pappi of numerous barbellate bristles.
Heads

1–20+ in corymb-like arrays, radiate.
2n

=18, 27, 36.

Erigeron poliospermus

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

Dry open areas, roadsides, streambanks. Flowering May–Sep. 50–2200 m. BR, BW, Casc, Col, ECas, Est, Lava. CA, ID, WA; north to British Columbia, northeast to Alberta, east to SD, southeast to TX, south to Mexico. Native.
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. decumbens, E. disparipilus, 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 divergens var. divergens
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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