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Montana Field Guide

Montana Field Guides

Taprooted Fleabane - Erigeron radicatus

Native Species

Global Rank: G3G4
State Rank: S3S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank: 3

External Links

State Rank Reason (see State Rank above)
Known from at least a dozen mountain ranges and over two dozen specimen collections from western and central Montana. Most collections describe the abundance as common at the collection site. Sites are generally high elevations in the mountains serving to limit the potential for negative impacts to populations.
General Description
Taprooted perennial with a usually branched caudex. Stems ascending to erect, 2–6 cm. Herbage leaves glabrate; stems densely strigose. Leaves mostly basal, linear-oblanceolate, entire, 1–5 cm long. Heads solitary, radiate. Involucres hemispheric, 4–7 mm high; phyllaries in 2 or 3 series, villous-hirsute with purple-septate hairs, sometimes minutely glandular. Rays 20 to 45, white; ligules 4–7 mm long. Disk corollas 2.5–3 mm long. Achenes ca. 2 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Flowering occurs from mid-June to mid-August depending on local site conditions.

Species Range

Range Comments
AB, SK south to UT, WY and NE (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 12

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Dry, rocky sites in the alpine and subalpine; commonly on limestone.

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Citation for data on this website:
Taprooted Fleabane — Erigeron radicatus.  Montana Field Guide.  .  Retrieved on , from