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Montana Field Guide

Montana Field Guides

Hoary False-alyssum - Berteroa incana
Other Names:  Hoary False Madwort, Hoary Alyssum

Noxious Weed: Priority 2B
Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 0

External Links

General Description
Annual. Stems erect, 20–75 cm, usually branched below and above. Basal leaves petiolate, oblanceolate with entire margins, soon deciduous. Stem leaves similar, sessile, erect, 1–3 cm long, reduced above. Vestiture of dense, stellate, appressed trichomes. Inflorescence a narrow, simple or compound, many-flowered raceme. Flowers white; sepals 2–3 mm long; petals 4–6 mm long. Fruit elliptic, inflated, 4–7 mm long, with stellate trichomes; mature style 1–2 mm long; pedicels 4–7 mm long; seeds 3–7 per locule (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Introduced in scattered locations across North America; native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 425

(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:
Hoary False-alyssum — Berteroa incana.  Montana Field Guide.  .  Retrieved on , from