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one-stem fleabane

dwarf blue fleabane, volcanic fleabane

Habit Plants perennial, 3–15 cm; fibrous-rooted, rhizomatous, caudices branched or not. Plants perennial, 4–10 cm; taprooted, with branching caudices.
Stems

erect, sparsely to moderately villous, eglandular.

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

Basal leaves

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

margins entire, sometimes moderately ciliate;

surfaces glabrous to glabrate.

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.

Cauline leaves

obovate to linear, abruptly reduced distally;

surfaces usually hirsute.

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

Involucres

3–7 × 8–16 mm.

3–5 × 8–11 mm.

Ray florets

30–50+, lavender to purple;

rays 5–10 × 0.6–2.2 mm.

15–30, lavender to purple;

rays 3–8 × 0.7–1.3 mm.

Disc florets

2–3 mm.

corollas 2.5–3.5 mm.

Phyllaries

in 2 series;

margins usually ragged;

surfaces moderately to densely villous.

in 3–4 unequal series;

surfaces sparsely strigose, eglandular.

Fruits

1–2 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.

1–2 mm, nearly glabrous to sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

1, radiate.

1, radiate.

2n

=27.

Erigeron simplex

Erigeron elegantulus

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

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

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

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