Erigeron decumbens

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 309. 1840.

Common names: Willamette fleabane
EndemicConservation concern
Treatment appears in FNA Volume 20. Treatment on page 279. Mentioned on page 274, 275.

Perennials, 5–60 cm (colonial); taprooted, caudex branches rhizomelike plants. Stems (often purplish) erect or decumbent at bases, sparsely strigillose (basal-cells inclined, hairs even-width), eglandular. Leaves basal (often withering by flowering) and cauline; basal blades linear to narrowly oblanceolate, 50–120 (–180) × 3–6 (–11) mm, cauline 3-nerved, gradually reduced distally, margins entire, faces hirtellous, eglandular. Heads (1–) 2–5 (–18) borne singly or in loosely corymbiform arrays. Involucres (4.5–) 5–6 × 9–12 mm. Phyllaries in 2–3 (–4) series (linear-lanceolate, apices linear-acuminate), sparsely to moderately villous, eglandular. Ray-florets 26–57; corollas white to bluish, sometimes drying pinkish to pale blue, 7–12 mm, laminae not coiling or reflexing. Disc corollas 3–3.5 mm. Cypselae 1.2–1.6 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of (6–) 12–16 bristles.


Phenology: Flowering May–Jul.
Habitat: Heavy soils in seasonally wet or dry upland prairie grasslands
Elevation: 100–300 m

Discussion

Of conservation concern.

Erigeron decumbens is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron decumbens"
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 +
12 cm120 mm <br />0.12 m <br /> (18 cm180 mm <br />0.18 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
linear +  and narrowly oblanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
Willamette fleabane +
not 2-lipped +  and actinomorphic +
pinkish +  and pale blue +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 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 /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
fertile +  and bisexual +
100–300 m +
strigose +  and hirtellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Heavy soils in seasonally wet or dry upland prairie grasslands +
disciform +  and discoid +
in loosely corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
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 /> (0.6 cm6 mm <br />0.006 m <br />) +
turbinate;hemispheric +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
not coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering May–Jul. +
narrowly elliptic +  and linear-lanceolate +
Trans. Amer. Philos. Soc., n. s. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Endemic +  and Conservation concern +
prostrate +  and decumbent +
decumbent +  and erect +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron decumbens +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
5 cm50 mm <br />0.05 m <br /> (60 cm600 mm <br />0.6 m <br />) +