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Snake River daisy, white cushion fleabane

showy daisy, showy fleabane

Habit Plants perennial, 8–22 cm; taprooted, with branching caudices. Plants perennial, 15–75 cm; rhizomatous, fibrous-rooted, caudices branching.
Stems

erect, sparsely to moderately hirsute to strigose, eglandular.

erect;

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

Basal leaves

persistent, narrowly spatulate to narrowly oblanceolate-elliptic, 30–80 × 3–5 mm;

margins entire, with 1 prominent vein;

surfaces moderately to densely strigose, eglandular.

usually withering by flowering, oblanceolate to spatulate.

Cauline leaves

few, linear, 10–40 × 1–3 mm, reduced distally.

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

margins entire, usually long-ciliate;

surfaces glabrous, rarely remotely strigose.

Involucres

3.5–8 × 12–18 mm.

3–7 × 11–16 mm.

Ray florets

25–50, white or cream, occasionally fading to pink;

rays 4–8 × 1–3 mm.

40–115+, lavender to purple;

rays 7–11 × 0.7–1.5 mm.

Disc florets

corollas 3–4 mm.

2–3 mm.

Phyllaries

in 2–3 series, usually with dark green medial area with or without orange stripe;

surfaces moderately to densely hirsute or strigose, moderately to densely glandular.

in 2–3+ series, usually with orange stripe;

surfaces basally hirsute to villous, occasionally minutely glandular.

Fruits

1.5–3 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.

2–3 mm, glabrous to sparsely strigose;

inner pappi of numerous barbellate bristles.

Heads

usually 1, radiate.

1–5+ in corymb-like arrays, radiate.

Erigeron disparipilus

Erigeron speciosus

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

Open rocky areas, ridges. Flowering Jun–Jul. 1100–1800 m. BW. ID, WA. Native.

Some floras recognize plants with stem hairs in the same orientation (versus mixed) as E. davisii. The ranges and habitat of these taxa are, however, sympatric. Until further evidence shows otherwise, there is no compelling reason to recognize E. davisii as distinct from E. disparipilus.

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 255
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. 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. philadelphicus, E. poliospermus, E. pumilus, E. simplex, E. stanselliae, E. strigosus, E. tener, E. vagus
Synonyms Erigeron davisii, Erigeron engelmannii, Erigeron engelmannii ssp. davisii, Erigeron engelmannii var. davisii Erigeron speciosus var. macranthus, Erigeron speciosus var. speciosus, Erigeron subtrinervis
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