The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

dwarf blue fleabane, volcanic fleabane

Philadelphia fleabane

Habit Plants perennial, 4–10 cm; taprooted, with branching caudices. Plants annual, biennial, or short-lived perennial, 10–80 cm; roots fibrous, caudices usually simple.
Stems

erect to basally ascending, sparsely to moderately strigose, eglandular.

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

Basal leaves

persistent, linear to filiform, 20–50 × 0.5–1 mm, white, bases sheathing;

margins entire;

tips round to acute or acuminate;

surfaces sparsely to moderately strigose.

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

abruptly reduced and usually restricted to basal ? of stem, bases sheathing.

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

surfaces eglandular.

Involucres

3–5 × 8–11 mm.

3–6 × 6–15 mm.

Ray florets

15–30, lavender to purple;

rays 3–8 × 0.7–1.3 mm.

150–250, white to pink;

rays 2–7 × 0.2–0.5 mm.

Disc florets

corollas 2.5–3.5 mm.

corollas 2–3 mm.

Phyllaries

in 3–4 unequal series;

surfaces sparsely strigose, eglandular.

in 2–3 series;

surfaces sparsely to moderately hirsute, minutely glandular.

Fruits

1–2 mm, nearly glabrous to sparsely strigose;

inner pappi of numerous barbellate bristles.

1–1.5 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

Heads

1, radiate.

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

2n

=27.

=18.

Erigeron elegantulus

Erigeron philadelphicus

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

Rocky areas, sagebrush, coniferous forests. Flowering Jun–Aug. 700–2500 m. BR, BW, Casc, Owy. CA. Native.

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. eatonii, 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
Synonyms Erigeron philadelphicus var. philadelphicus
Web links