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threadleaf fleabane

seaside daisy, seaside fleabane

Habit Plants perennial, 9–40 cm; taprooted, with branching caudices. Plants perennial, 3–30 cm; fibrous-rooted, rhizomatous, caudices usually simple, occasionally branching.
Stems

erect, moderately to densely strigose, eglandular.

decumbent, procumbent or ascending, sparsely to moderately hirsute, usually minutely glandular.

Basal leaves

persistent, linear to filiform, 20–80 × 0.5–2 mm;

margins entire;

tips rounded to acute or acuminate;

surfaces moderately to densely strigose.

persistent, obovate to broadly spatulate, 15–40 × 5–25 mm;

margins entire;

surfaces usually glabrous and eglandular.

Cauline leaves

gradually reduced distally or not.

similar to basal, 7–30 × 3–15 mm, gradually reduced distally.

Involucres

4–6 × 7–11 mm.

5–10 × 10–21 mm.

Ray florets

20–40, white to purple;

rays 3–9 × 0.7–1.5 mm.

70–100, lavender to purple;

rays 6–9 × 1–2 mm.

Disc florets

corollas 2–4 mm.

corollas 4–6 mm.

Phyllaries

in 2–4 series;

surfaces moderately to densely strigose or villous, sometimes nearly glabrous distally, densely minutely glandular.

in 3–4 series;

surfaces moderately to densely villous, sparsely to moderately glandular.

Fruits

1–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

2–3 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–5 in corymb-like arrays, radiate.

1(3), radiate.

2n

=18.

=18.

Erigeron filifolius

Erigeron glaucus

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

Rocky areas, sagebrush, juniper and pine forests. Flowering Apr–Aug. 50–2200 m. BR, BW, Col, ECas, Lava, Owy. CA, ID, NV, WA; north to British Columbia, northeast to MT, southeast to UT. Native.

If subspecific taxa were recognized, Oregon specimens would correspond to the typical variety.

Coastal dunes, bluffs. Flowering May–Aug. 0–500 m. Est. CA. Native.

Source Flora of Oregon, volume 2, page 256
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 257
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. 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
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. 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
Synonyms Erigeron filifolius var. filifolius, Erigeron filifolius var. robustior
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