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Montana Field Guide

Montana Field Guides

Small-leaf Rockcress - Boechera microphylla
Other Names:  Arabis microphylla

Native Species

Global Rank: G4
State Rank: SNR

Agency Status
MNPS Threat Rank:

External Links

General Description
Perennial, sometimes mat-forming from a simple to branched caudex. Stems 10–30 cm, slender, terminal. Basal leaves linear to narrowly oblanceolate, 7–20 mm long with entire or few-toothed margins. Stem leaves lanceolate, weakly auriculate. Vestiture of sparse, simple to branched hairs on basal leaves, glabrous above. Petals pink to purple, 4–6 mm long. Fruits spreading to erect, 2–5 cm × 1–1.5 mm; seeds wing-margined, in 1 row per locule (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
BC, MT south to CA and UT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX). Lescia's distributional data, however, are based on the taxonomic concept of two varieties. Users should note that Flora North America (Vol. 7) treats the varieties as separate species (B. casadensis and B. macounii).

Observations in Montana Natural Heritage Program Database
Number of Observations: 59

(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)


  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Flora of North America Editorial Committee, eds. 2010. Flora of North America North of Mexico. Volume 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, Inc., NY. 832 pp.
    • Hitchcock, C. L., A. Cronquist, M. Ownbey, and J. W. Thompson. 1964. Vascular Plants of the Pacific Northwest. Part 2: Salicaceae to Saxifragaceae. University of Washington Press, Seattle. 597 pp.
    • Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
    • Simanonok, M. 2018. Plant-pollinator network assembly after wildfire. Ph.D. Dissertation. Bozeman, MT: Montana State University. 123 p.
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Citation for data on this website:
Small-leaf Rockcress — Boechera microphylla.  Montana Field Guide.  .  Retrieved on , from