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Montana Field Guide

Montana Field Guides

Lyre-leaf Rockcress - Arabidopsis lyrata
Other Names:  Arabis lyrata, Arabis kamchatica

Potential Species of Concern
Native Species

Global Rank: G5
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.

Montane and lower subalpine sites. Exact habitat preferences in Montana uncertain.

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

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Citation for data on this website:
Lyre-leaf Rockcress — Arabidopsis lyrata.  Montana Field Guide.  .  Retrieved on , from