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Montana Field Guide

Montana Field Guides

Creeping Yellowcress - Rorippa sylvestris
Other Names:  Yellow Fieldcress, Keek

Non-native Species

Global Rank: G5
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Stems ascending, branched, 15–50 cm. Leaves all cauline, petiolate, 2–15 cm long; the blade oblong, deeply pinnately lobed and dentate, the apical lobe similar to the lateral. Vestiture of sparse hairs on the lower stem otherwise glabrous. Petals yellow, 3–5 mm long. Fruit a linear silicle, 9–16 × up to 1 mm, glabrous; style 0.8–1.5 mm long; pedicels spreading, 7–11 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced to BC to ND south to CA, MO; native to Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 13

(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)

Moist soil of fields, roadsides, gravelly riverbanks; plains, valleys (Lesica 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
    • 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.
  • 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.
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Citation for data on this website:
Creeping Yellowcress — Rorippa sylvestris.  Montana Field Guide.  .  Retrieved on , from