''Erigeron filifolius'' is a

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

n species of flowering plants in the family Asteraceae known by the common names thread-leaf fleabane. ''Erigeron filifolius'' is widespread across much of western

. It has been found in western Canada ( British Columbia) and the western United States, primarily east of the crest of the

Cascade Range The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, ...

of Washington, Oregon, and northern California extending eastward to southern Idaho and northeast Nevada. Within its distribution, it occupies a large range of elevations from near sea level to .Calflora taxon report, University of California, ''Erigeron filifolius'' (Hook.) Nutt., threadleaf fleabane
/ref> ''Erigeron filifolius'' is a branched perennial herb up to in height. Leaves are long and thin, often thread-like, up to long. Each stem sometimes produces only 1 flower head per stem, sometimes flat-topped clusters of 10 or more. Each head may contain as many as 125 white, blue, pink, or lavender ray florets surrounding numerous yellow disc florets.Flora of North America, ''Erigeron filifolius'' (Hooker) Nuttall, Thread-leaf fleabane
/ref>

References

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* {{Taxonbar, from=Q15589831 filifolius Flora of the Western United States Plants described in 1834 Taxa named by William Jackson Hooker Taxa named by Thomas Nuttall Flora without expected TNC conservation status