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Montana Field Guide

Montana Field Guides

Big-head Evax - Evax prolifera
Other Names:  Diaperia prolifera, Filago prolifera

Status Under Review
Undetermined Origin

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Gray-woolly, taprooted annual. Stems erect, 2–10 cm, simple or branched at the base. Leaves: basal small, deciduous; cauline alternate, oblanceolate, entire, 3–15 mm long. Inflorescence terminal, wooly glomerules of sessile heads closely subtended by leaves. Heads disciform; involucre absent; receptacle conical, chaffy. Disk flowers tubular, minute; the outer female; inner functionally male. Pappus absent. Achenes oblong, compressed, <1 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
MT south to NM, TX, LA and AL. Known from Custer and Powder River counties (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(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)


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Citation for data on this website:
Big-head Evax — Evax prolifera.  Montana Field Guide.  .  Retrieved on , from