Erigeron glabellus

Nuttall

Gen. N. Amer. Pl. 2: 147. 1818.

Common names: Streamside fleabane
Endemic
Treatment appears in FNA Volume 20. Treatment on page 331. Mentioned on page 259, 263, 267, 332.

Biennials or perennials, 7–50 (–70) cm; rhizomatous, caudices or rhizomes relatively short and thickened, simple or branched, usually appearing merely fibrous-rooted. Stems erect or slightly basally ascending, hirsute or hirsuto-villous to strigose or glabrate, eglandular. Leaves basal (persistent) and cauline; basal blades oblanceolate to oblanceolate-spatulate, 40–150 × 3–15 mm, margins usually entire, sometimes shallowly dentate, faces hirsute or hirsuto-villous to sparsely strigose or glabrate, eglandular; cauline blades usually becoming lanceolate, abruptly or gradually reduced distally (bases sometimes subclasping). Heads 1–15. Involucres 5–9 × 10–20 mm. Phyllaries in (2–) 3–4 series (greenish), hirsute to strigose, eglandular. Ray-florets 125–175; corollas white to pink or blue, 8–15 mm, laminae (nearly filiform) coiling tardily at tips. Disc corollas 4–5.5 mm. Cypselae 1.2–1.5 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 16–20 bristles.

Distribution

V20-753-distribution-map.gif

Alta., B.C., Man., N.W.T., Ont., Sask., Yukon, Alaska, Colo., Idaho, Minn., Mont., N.Dak., N.Mex., S.Dak., Utah, Wis., Wyo.

Discussion

Varieties 2 (2 in the flora).

Erigeron glabellus is recognized by its subsimple caudices and fibrous-rooted bases, relatively numerous rays with nearly filiform laminae, and nonglandular vestiture.

Selected References

None.

Key

1 Stems strigose (hairs closely appressed to ascending), sometimes sparsely so to glabrate Erigeron glabellus var. glabellus
1 Stems hirsute to hirsuto-villous (hairs spreading) Erigeron glabellus var. pubescens
... more about "Erigeron glabellus"
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 +
4 cm40 mm <br />0.04 m <br /> (15 cm150 mm <br />0.15 m <br />) +
oblanceolate +  and oblanceolate-spatulate +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
fibrous-rooted +, branched +, simple +  and rhizomatous +
Streamside fleabane +
not 2-lipped +  and actinomorphic +
white +  and pink or blue +
0.8 cm8 mm <br />0.008 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 +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Minn. +, Mont. +, N.Dak. +, N.Mex. +, S.Dak. +, Utah +, Wis. +  and Wyo. +
strigose +, hirsuto-villous +  and sparsely strigose or glabrate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 /> (0.9 cm9 mm <br />0.009 m <br />) +
turbinate;hemispheric +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
dentate +  and entire +
Not (?) +  and Scarious (?) +
2-carpellate +
hirsute +  and strigose +
narrowly elliptic +  and linear-lanceolate +
Gen. N. Amer. Pl. +
bearing subulate enations +, hairy +  and bristly +
fibrous-rooted +, branched +, simple +  and rhizomatous +
exalbuminous +
prostrate +  and decumbent +
ascending +  and erect +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron glabellus +
Erigeron +
species +
inflated +  and tubular +
50 cm500 mm <br />0.5 m <br /> (70 cm700 mm <br />0.7 m <br />) +
perennial +  and biennial +
7 cm70 mm <br />0.07 m <br /> (50 cm500 mm <br />0.5 m <br />) +
tree +, shrub +  and subshrub +