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Montana Field Guide

Montana Field Guides

Modoc County Yellowcress - Rorippa tenerrima

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Native Species

Global Rank: G5
State Rank: SNR
C-value: 4

Agency Status


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General Description
Glabrous annual from a thickened taproot. Stems prostrate to ascending, 3–20 cm long, branched. Leaves basal and cauline; the basal withering early; stem leaves oblanceolate, 1–8 cm long, pinnately lobed with sinuate margins, the terminal lobe largest. Petals yellow, 0.5–0.8 mm long, shorter than the sepals. Fruit a lanceolate silique, 3–7 × 1–1.5 mm, papillose (use 20X); style 0.2–0.6 mm long; pedicels ascending, 1–3 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
BC to SK, south to CA, NM, TX, MO and Mexico (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 3

(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)

Mud along shores of lakes, ponds, streams; plains, valleys, montane (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus rufocinctus (Thorp et al. 1983).

  • 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.
    • Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.
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Citation for data on this website:
Modoc County Yellowcress — Rorippa tenerrima.  Montana Field Guide.  .  Retrieved on , from