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threadleaf fleabane

showy daisy, showy fleabane

Habit Plants perennial, 9–40 cm; taprooted, with branching caudices. Plants perennial, 15–75 cm; rhizomatous, fibrous-rooted, caudices branching.
Stems

erect, moderately to densely strigose, eglandular.

erect;

surfaces glabrous to rarely remotely hirsute, sometimes minutely glandular distally.

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.

usually withering by flowering, oblanceolate to spatulate.

Cauline leaves

gradually reduced distally or not.

lanceolate, 20–80 × 5–15 mm, gradually reduced distally, bases ± clasping;

margins entire, usually long-ciliate;

surfaces glabrous, rarely remotely strigose.

Involucres

4–6 × 7–11 mm.

3–7 × 11–16 mm.

Ray florets

20–40, white to purple;

rays 3–9 × 0.7–1.5 mm.

40–115+, lavender to purple;

rays 7–11 × 0.7–1.5 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 2–3+ series, usually with orange stripe;

surfaces basally hirsute to villous, occasionally minutely glandular.

Fruits

1–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

2–3 mm, glabrous to sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1–5 in corymb-like arrays, radiate.

1–5+ in corymb-like arrays, radiate.

2n

=18.

Erigeron filifolius

Erigeron speciosus

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.

Conifer forests, moist slopes, riverbanks, wet meadows. Flowering Jun–Sep. 50–2500 m. BR, BW, CR, WV. ID, NV, WA; north to British Columbia, northeast to Alberta, east to NE, southeast to NM. Native.

Source Flora of Oregon, volume 2, page 256
James Riser, Stephen Meyers
Flora of Oregon, volume 2 draft
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. stanselliae, E. strigosus, E. tener, E. vagus
Synonyms Erigeron filifolius var. filifolius, Erigeron filifolius var. robustior Erigeron speciosus var. macranthus, Erigeron speciosus var. speciosus, Erigeron subtrinervis
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