OregonFlora species comparison

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Erigeron eximius

Erigeron disparipilus
Erigeron disparipilus

Snake River daisy, white cushion fleabane
Habit Plants perennial, 8–22 cm; taprooted, with branching caudices.
Stems

erect, sparsely to moderately hirsute to strigose, eglandular.
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.
Cauline leaves

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

3.5–8 × 12–18 mm.
Ray florets

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

rays 4–8 × 1–3 mm.
Disc florets

corollas 3–4 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.
Fruits

1.5–3 mm, sparsely to moderately strigose;

inner pappi of numerous barbellate bristles.
Heads

usually 1, radiate.

Erigeron eximius

Erigeron disparipilus
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.
Source Flora of Oregon, volume 2, page 255
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. 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
Synonyms Erigeron davisii, Erigeron engelmannii, Erigeron engelmannii ssp. davisii, Erigeron engelmannii var. davisii
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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