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Eaton's fleabane

Philadelphia fleabane

Habit Plants perennial, 4–28 cm; taprooted, caudices branching or not. Plants annual, biennial, or short-lived perennial, 10–80 cm; roots fibrous, caudices usually simple.
Stems

erect to ascending or decumbent, usually strigose to occasionally villous, becoming woolly distally, sometimes minutely glandular.

erect, sparsely to moderately hirsute to lanate, minutely glandular.

Basal leaves

persistent, linear to narrowly oblanceolate, 20–150 × 2–10 mm;

margins entire, usually with 3 distinct basal veins;

tips usually rounded to acute or acuminate;

surfaces strigose to hirsute, eglandular.

withering by flowering, oblanceolate to nearly spatulate, 20–170 × 5–35 mm;

margins nearly entire, coarsely serrate, lobulate, or shallowly dentate;

surfaces slightly to moderately strigose or hirsute, eglandular.

Cauline leaves

gradually to abruptly reduced distally, sometimes becoming linear and bract-like.

oblanceolate to lanceolate to elliptic or oblong, 5–130 × 3–25 mm, distally reduced, bases clasping;

surfaces eglandular.

Involucres

4–6 × 8–15 mm.

3–6 × 6–15 mm.

Ray florets

20–45, white to purple;

rays 3–8 × 0.8–2.5 mm.

150–250, white to pink;

rays 2–7 × 0.2–0.5 mm.

Disc florets

corollas 3–4 mm.

corollas 2–3 mm.

Phyllaries

in 2–3 series;

surfaces sparsely sericeous to densely villous, sometimes minutely glandular.

in 2–3 series;

surfaces sparsely to moderately hirsute, minutely glandular.

Fruits

2–3 mm, glabrate to remotely strigose;

inner pappi of numerous barbellate bristles.

1–1.5 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1–3 in scape- or corymb-like arrays, radiate.

(1)3–many in corymb-like arrays, radiate.

2n

=18.

Erigeron eatonii

Erigeron philadelphicus

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

Western United States. 6 varieties; 3 varieties treated in Flora.

Disturbed areas, streambanks, fields, meadows, forest openings. Flowering Apr–Sep. 0–1900 m. All ecoregions. CA, ID, NV, WA; nearly worldwide. Native.

Source Flora of Oregon, volume 2, page 256
James Riser, Stephen Meyers
Flora of Oregon, volume 2, page 260
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. 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
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. poliospermus, E. pumilus, E. simplex, E. speciosus, E. stanselliae, E. strigosus, E. tener, E. vagus
Subordinate taxa
E. eatonii var. lavandulus, E. eatonii var. plantagineus, E. eatonii var. villosus
Synonyms Erigeron philadelphicus var. philadelphicus
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