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Montana Field Guide

Montana Field Guides

Field Scabious - Knautia arvensis
Other Names:  Blue-button, Field Scabiosa

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 0

External Links

General Description
Taprooted perennial. Stems erect, branched above, 30–80 cm. Herbage hirsute. Basal leaves petiolate; blades oblanceolate, crenate, 3–15 cm long. Stem leaves oblanceolate, 4–20 cm long, deeply pinnately lobed; the lobes linear-lanceolate. Heads hemispheric, 1–3 cm across; involucral bracts lanceolate, 5–12 mm long; receptacle bracts absent. Flowers: calyx hirsute with 8 to 12 aristate sepals 2–4 mm long; corolla 4-lobed, light purple, glabrous to sparsely hairy, 6–8 mm long; lobes 1–3 mm long; stigma shallowly lobed; stamens barely exserted. Achene conical, 5–6 mm long, hirsute (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Introduced to northern U.S., adjacent Canada; 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: 112

(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)

Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see


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Citation for data on this website:
Field Scabious — Knautia arvensis.  Montana Field Guide.  .  Retrieved on , from