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threadleaf fleabane

one-stem fleabane

Habit Plants perennial, 9–40 cm; taprooted, with branching caudices. Plants perennial, 3–15 cm; fibrous-rooted, rhizomatous, caudices branched or not.
Stems

erect, moderately to densely strigose, eglandular.

erect, sparsely to moderately villous, eglandular.

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, oblanceolate to spatulate, 50–350 × 30–90 mm;

margins entire, sometimes moderately ciliate;

surfaces glabrous to glabrate.

Cauline leaves

gradually reduced distally or not.

obovate to linear, abruptly reduced distally;

surfaces usually hirsute.

Involucres

4–6 × 7–11 mm.

3–7 × 8–16 mm.

Ray florets

20–40, white to purple;

rays 3–9 × 0.7–1.5 mm.

30–50+, lavender to purple;

rays 5–10 × 0.6–2.2 mm.

Disc florets

corollas 2–4 mm.

2–3 mm.

Phyllaries

in 2–4 series;

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

in 2 series;

margins usually ragged;

surfaces moderately to densely villous.

Fruits

1–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

1–2 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–5 in corymb-like arrays, radiate.

1, radiate.

2n

=18.

Erigeron filifolius

Erigeron simplex

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.

Rocky areas, meadows. Flowering Jul–Aug. 2400–3000 m. BW. ID, NV; northeast to MT, east to WY, southeast to CO, NM. Native.

Source Flora of Oregon, volume 2, page 256
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 261
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. 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 Erigeron grandiflorus
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