Erigeron disparipilus

Cronquist

Brittonia 6: 194. 1947.

Common names: White cushion fleabane
Endemic
Treatment appears in FNA Volume 20. Treatment on page 285. Mentioned on page 271.

Perennials, 3–12 cm; taprooted, caudices branched. Stems erect, densely pilose to hirsute or villoso-hirsute (hairs usually slightly ascending, loose, often mixed in orientations, of unequal lengths, relatively thin-based), eglandular. Leaves mostly basal (persistent), (petioles prominently ciliate, hairs thick-based, spreading); blades linear to linear-oblanceolate, 20–40 × 1–2 mm, margins entire, faces finely hirsute, eglandular; cauline reduced, restricted to proximal 1/3 of stems. Heads 1. Involucres 5–7 × 8–16 mm. Phyllaries in 2–3 series, hirsute to hirsuto-strigose, minutely glandular. Ray-florets mostly 30–60; corollas usually white, sometimes fading pink, rarely blue, 5–10 mm, laminae loosely coiling. Disc corollas 2.8–4 mm. Cypselae 1.8–2.2 mm, 2-nerved, faces moderately, loosely strigose; pappi: outer of setae, inner of 15–25 bristles.


Phenology: Flowering May–Aug.
Habitat: Gravelly and rocky slopes, ridges, sagebrush, grassland
Elevation: 600–2000(–2200) m

Discussion

Erigeron disparipilus is similar to E. nanus but less variable. The range of E. disparipilus barely contacts that of E. nanus in southeastern Idaho and they have different ecologies; blue rays of E. disparipilus in Owyhee County may indicate that hybridization occurs.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron disparipilus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, corymbiform +  and loose +
indeterminate +  and determinate +
Guy L. Nesom +
Cronquist +
decurrent +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
linear;linear-oblanceolate +
1mm;2mm +
rugulose +  and muricate +
White cushion fleabane +
not 2-lipped +  and actinomorphic +
blue +, fading pink +  and white +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
fertile +  and bisexual +
Idaho +, Oreg. +  and Wash. +
600–2000(–2200) m +
strigose +  and hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Gravelly and rocky slopes, ridges, sagebrush, grassland +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
turbinate;hemispheric +
0.8 cm8 mm <br />0.008 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
petiolate +  and sessile +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering May–Aug. +
3-nerved +  and 1-nerved +
hirsute +  and hirsuto-strigose +
narrowly elliptic +  and linear-lanceolate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron disparipilus +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
tree +, shrub +  and subshrub +