OregonFlora species comparison

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Erigeron tweedyi

Erigeron tener

slender fleabane
Habit Plants perennial, 3–15 cm; taprooted, caudices branching.
Stems

erect, sparsely strigose, sometimes minutely glandular.
Basal leaves

persistent, narrowly oblanceolate-elliptic to spatulate, 5–50 × 1–4 mm;

margins entire;

tips acute;

surfaces densely strigose.
Cauline leaves

few, linear, 5–20 × ~1 mm, abruptly reduced distally.
Involucres

3–5 × 7–11 mm.
Ray florets

15–24, blue to purple;

rays 3–6 × 0.5–1 mm.
Disc florets

corollas 2–4 mm.
Phyllaries

medial areas usually purple;

surfaces glabrous to moderately hirsute, densely glandular.
Fruits

1–3 mm, sparsely strigose;

inner pappi of numerous barbellate bristles.
Heads

1(3), radiate.

Erigeron tweedyi

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

Rocky areas, talus, slops, crevices. Flowering May–Aug. 1700–2500 m. BR. CA, ID, NV; northeast to MT, east to WY, southeast to AZ. Native.

In Oregon, Erigeron tener is thus far known only from Steens Mountain.
Source Flora of Oregon, volume 2, page 262
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. speciosus, E. stanselliae, E. strigosus, E. vagus
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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