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threadleaf fleabane

rambling fleabane

Habit Plants perennial, 9–40 cm; taprooted, with branching caudices. Plants perennial, 3–10 cm; taprooted, caudices branching.
Stems

erect, moderately to densely strigose, eglandular.

erect, nearly glabrous to remotely hirsute, 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 with 3–5 distal lobes, 6–25 × 3–10 mm;

margins entire;

surfaces moderately to densely hirsute.

Cauline leaves

gradually reduced distally or not.

absent or reduced to linear bracts.

Involucres

4–6 × 7–11 mm.

5–7 × 10–13 mm.

Ray florets

20–40, white to purple;

rays 3–9 × 0.7–1.5 mm.

25–40, white to lavender to purple;

rays 6–9 × 0.5–1.5 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; purplish to green, with yellow-orange medial stripe;

surfaces remotely hirsute to basally villous.

Fruits

1–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

2–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–5 in corymb-like arrays, radiate.

1, radiate.

2n

=18.

=18.

Erigeron filifolius

Erigeron vagus

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, slopes. Flowering Jun–Aug. 1500–3100 m. BW. CA, NV; southeast to CO. Native.

Source Flora of Oregon, volume 2, page 256
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 262
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
Synonyms Erigeron filifolius var. filifolius, Erigeron filifolius var. robustior
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