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Montana Field Guide

Montana Field Guides

Kamchatica Rockcress - Arabidopsis lyrata ssp. kamchatica
Other Names:  Arabis lyrata

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Potential Species of Concern
Native Species

Global Rank: G5T5
State Rank: SH
(see State Rank Reason below)
State Threat Score: No Known Threats

Agency Status


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State Rank Reason (see State Rank above)
Known from one 1952 collection near Mount Brown in Glacier National Park.
General Description
Lyre-leaf Rockcress is a short-lived perennial with 1 to several simple or branched stems, which are 1-3 dm high and arise from a simple or branched rootcrown. The mostly basal leaves, which are 1-6 cm long, have lobed, broadly lance-shaped blades narrowed to a petiole of equal length. The alternate stem leaves are sessile and few-lobed. Foliage is sparsely covered with long, stiff hairs. 3-20 erect, stalked flowers are borne in a compact inflorescence that expands as the fruits mature. Each flower has 4 glabrous sepals which are ca. 3 mm long, 4 white petals which are 5-8 mm long, 4 long stamens, and 2 short stamens. The glabrous, slightly compressed, linear capsules (siliques) are 2-4 cm long, ca. 1 mm wide, and are held erect.

Flowering and possibly fruiting in May.

Diagnostic Characteristics
The deeply lobed leaves separate this species from all other ARABIS in our area. Species of HALIMOLOBOS are also similar but have either clasping stem leaves or hairy siliques.

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)

Along rivers and lakes in damp woods of montane and possibly subalpine zones.

Threats or Limiting Factors
Threat impact not assigned because threats are not known (MTNHP Threat Assessment 2021).

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Kamchatica Rockcress — Arabidopsis lyrata ssp. kamchatica.  Montana Field Guide.  .  Retrieved on , from