OregonFlora species comparison

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Erigeron poliospermus

Erigeron philadelphicus

hairy-seeded daisy, purple-cushion fleabane

Philadelphia fleabane
Habit Plants annual, biennial, or short-lived perennial, 10–80 cm; roots fibrous, caudices usually simple.
Stems

erect, sparsely to moderately hirsute to lanate, minutely glandular.
Basal leaves

withering by flowering, oblanceolate to nearly spatulate, 20–170 × 5–35 mm;

margins nearly entire, coarsely serrate, lobulate, or shallowly dentate;

surfaces slightly to moderately strigose or hirsute, eglandular.
Cauline leaves

oblanceolate to lanceolate to elliptic or oblong, 5–130 × 3–25 mm, distally reduced, bases clasping;

surfaces eglandular.
Involucres

3–6 × 6–15 mm.
Ray florets

150–250, white to pink;

rays 2–7 × 0.2–0.5 mm.
Disc florets

corollas 2–3 mm.
Phyllaries

in 2–3 series;

surfaces sparsely to moderately hirsute, minutely glandular.
Fruits

1–1.5 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.
Heads

(1)3–many in corymb-like arrays, radiate.
2n

=18.

Erigeron poliospermus

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

Disturbed areas, streambanks, fields, meadows, forest openings. Flowering Apr–Sep. 0–1900 m. All ecoregions. CA, ID, NV, WA; nearly worldwide. Native.
Source Flora of Oregon, volume 2, page 260
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. 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. poliospermus, E. pumilus, E. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
Subordinate taxa
E. poliospermus var. poliospermus
Synonyms Erigeron philadelphicus var. philadelphicus
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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