Erigeron caespitosus

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 307. 1840.

Common names: Tufted fleabane
Endemic
Treatment appears in FNA Volume 20. Treatment on page 283. Mentioned on page 21, 274, 284, 289.

Perennials, 5–25 (–30) cm; taprooted, caudices relatively thick, usually branched. Stems decumbent-ascending (greenish proximally), usually densely hirsute to hirtellous (hairs spreading to deflexed, gradually attenuate, basal-cells erect), sometimes strigose (in Saskatchewan and Yukon), eglandular. Leaves basal (persistent) and cauline; basal blades (1–) 3-nerved, narrowly oblanceolate to spatulate, (10–) 20–90 (–120) × 2–15 mm, margins entire (apices rounded to obtuse), faces densely hirtellous, eglandular; cauline blades oblong-ovate to linear, ± reduced distally. Heads 1–4 (branches from distal 1/2 of stem). Involucres 4–7 × 9–18 mm. Phyllaries in 3–4 series, densely hirsuto-canescent to hirtellous (hairs spreading), moderately minutely glandular. Ray-florets 30–100; corollas white to bluish, 5–15 mm, laminae coiling. Disc corollas 3–4.4 mm. Cypselae 1.7–2.2 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae or scales, inner of 15–25 bristles. 2n = 18, 36.


Phenology: Flowering Jun–Aug.
Habitat: Rocky or sandy, grassy hills, sagebrush-aspen, pinyon-juniper, to spruce and tundra northward
Elevation: 1300–3000(–3600) m

Distribution

V20-580-distribution-map.gif

Alta., B.C., Man., Sask., Yukon, Alaska, Ariz., Colo., Idaho, Mont., Nebr., N.Mex., N.Dak., S.Dak., Utah, Wash., Wyo.

Discussion

Erigeron caespitosus as recognized here is highly variable and perhaps justifiably could be divided into more than one taxon. Plants at lower elevations tend to produce tall stems branching above the middle and long, white rays. At higher elevations, especially in Idaho, western Montana, Utah, and Wyoming, stems tend to be shorter and simple and the rays commonly are blue to violet. In the Bitterroot Mountains (Ravalli and Deerlodge counties, Montana), short-stemmed, blue-rayed plants also have strigose cauline vestiture (in contrast to typically deflexed-hirtellous stems); these vestiture variants occur in the same area with plants apparently similar in all other features. Strigose populational variants also occur in Saskatchewan and Yukon, and E. abajoensis, largely distinguished by strigose cauline vestiture, might be considered a regional variant of E. caespitosus. In eastern Idaho and southwestern Montana, plants of E. caespitosus are commonly encountered with cauline leaves obovate and distinctly subclasping. Plants with strongly 3-nerved basal leaves occur in Carbon and Gallatin counties, Montana.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Erigeron caespitosus"
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 +
Nuttall +
9 cm90 mm <br />0.09 m <br /> (12 cm120 mm <br />0.12 m <br />) +
2 cm20 mm <br />0.02 m <br /> (9 cm90 mm <br />0.09 m <br />) +
narrowly oblanceolate +  and spatulate +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
oblong-ovate +  and linear +
Tufted fleabane +
not 2-lipped +  and actinomorphic +
white +  and bluish +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.3 cm3 mm <br />0.003 m <br /> (0.44 cm4.4 mm <br />0.0044 m <br />) +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, Sask. +, Yukon +, Alaska +, Ariz. +, Colo. +, Idaho +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
1300–3000(–3600) m +
strigose +  and hirtellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky or sandy, grassy hills, sagebrush-aspen, pinyon-juniper, to spruce and tundra northward +
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 />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
turbinate;hemispheric +
0.9 cm9 mm <br />0.009 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Jun–Aug. +
3-nerved +  and 1-nerved +
densely hirsuto-canescent +  and hirtellous +
narrowly elliptic +  and linear-lanceolate +
Trans. Amer. Philos. Soc., n. s. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
prostrate +  and decumbent +
decumbent-ascending +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron caespitosus +
Erigeron +
species +
inflated +  and tubular +
25 cm250 mm <br />0.25 m <br /> (30 cm300 mm <br />0.3 m <br />) +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
tree +, shrub +  and subshrub +