Erigeron filifolius (Threadleaf daisy)

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Erigeron filifolius (Hook.) Nutt.

Threadleaf daisy, threadleaf fleabane

Kingdom	Plantae	Plants, but not fungi, lichens, or algae
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Asteridae	A large class that encompasses asters
Order	Asterales	Flowering plants with a central disk flower and surrounding petals, like daisies
Family	Asteraceae	The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
Genus	Erigeron	From Greek eri, “early,” and geron, “old man,” for the fluffy white seed heads and early flowering
Species	filifolius	“With thread-like foliage”

About plant names...

Threadleaf daisy is a member of the enormous aster family.

Identification: This daisy's common name refers to its extremely narrow leaves and nearly bare stems. Plants reach 24" (60 cm) in height. Stems have dense stiff white hairs. The flowers look like most daisies, with many petals surrounding a yellow center. Flowers may be white, but they are usually violet in color. Plants are found at elevations between 4000-6500' (1.2-2.0 km).

6/2/2009 · Zion National Park, Utah
≈ 13 × 10" (31 × 24 cm) ID is uncertain

Here are some similar species:

	*Erigeron annuus*	You are here Erigeron filifolius	*Erigeron philadelphicus*
Common Name	daisy fleabane	threadleaf daisy	common fleabane
Plant	Up to 5' (1.5 m) high. Stems have white hairs that grow *outward from the stem*.	Up to 24" (60 cm) in height. Stems have dense stiff white hairs. Plants are found at elevations between 4000-6500' (1.2-2.0 km).	Up to 3' (1 m) high, with ribbed stems covered with soft white hairs. The hairs grow *outward from the stem*.
Flowers	White or light pink, about ½" (1.3 cm) across, over 100 narrow petals and yellow centers. Flowers from *April to November*.	Flowers may be white, but they are usually violet in color.	Flowers are pale pink, sometimes white, up to ½-¾" (1.3-1.9 cm) around, with 100-300 petals (*more than any other fleabane) and a yellow central disk. They flower from April to June*.
Leaves	Leaves alternate, attached to stem but not wrapped around it. Upper leaves narrow and pointed at the ends, with *coarse teeth* or sometimes no teeth. Lower leaves are more egg-shaped.	Leaves are very narrow.	Basal leaves are spatula-shaped, up to 4" (10 cm) × 1" (3 cm), with *coarse teeth. Upper leaves may be lance-shaped, but show a wide range of shapes. They usually clasp the stem*.
Range/ Zones	USDA Zones: 3a-8a		USDA Zones: 2-7
Habitats	Moist or semi-moist disturbed areas, pastures, abandoned fields, roadsides		Moist soils at the edges of fresh bodies of water, waste areas, fields, roadsides
Type	Wild	Wild	Wild
Occurrence	Common		Common

	*Erigeron strigosus*
Common Name	rough fleabane
Plant	These plants have an erect stem that has many fine white hairs, and are 12-36" (30-91 cm) tall. The hairs are antrorse strigose—they *lie down against the stem, in the upward direction*.
Flowers	White, about ½" (1.5 cm) in diameter, with 50-100 petals, and a yellow central disk. They flower from *May to September*.
Leaves	Mostly narrow, with a few fatter in the center, attached directly to the stem but not wrapped around it. Leaves *mostly untoothed*.
Range/ Zones
Habitats	Dry prairies, well-lit woods and fields, disturbed ground, roadsides
Type	Wild
Occurrence	Common

Online References:

Erigeron filifolius description by Thomas H. Kent, last updated 16 Sep 2020.

Range:

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