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threadleaf fleabane

golden fleabane

Habit Plants perennial, 9–40 cm; taprooted, with branching caudices. Plants perennial, 5–10 cm; fibrous-rooted, with short, usually unbranched caudices.
Stems

erect, moderately to densely strigose, eglandular.

erect; hirsute to villous, 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, spatulate to oblanceolate, 10–50 × 5–10 mm;

margins entire;

surfaces moderately to densely strigose, eglandular to minutely glandular.

Cauline leaves

gradually reduced distally or not.

5–10 × 1–5 mm abruptly reduced, often a single linear bract.

Involucres

4–6 × 7–11 mm.

4–6 × 10–15 mm.

Ray florets

20–40, white to purple;

rays 3–9 × 0.7–1.5 mm.

40–60, bright yellow;

rays 4–6 × 0.5–1.5 mm.

Disc florets

corollas 2–4 mm.

corollas 3–4 mm.

Phyllaries

in 2–4 series;

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

in 2–3 series, often purplish colored;

surfaces moderately to densely woolly-villous, sparsely glandular.

Fruits

1–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

2–3 mm, moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–5 in corymb-like arrays, radiate.

1, radiate.

2n

=18.

=18.

Erigeron filifolius

Erigeron aureus

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.

Ridges, talus, rocky slopes. Flowering Jul–Aug. 1600–2600 m. BW. WA; north to British Columbia, northeast to Alberta. Native.

In Oregon, this native species is currently known only from a single collection in the Eagle Cap Wilderness, Wallowa Mountains.

Source Flora of Oregon, volume 2, page 256
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 252
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. 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. 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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