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Montana Field Guide

Montana Field Guides

Watercress - Rorippa nasturtium-aquaticum
Other Names:  Nasturtium officinale

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

External Links






 
General Description
Nearly glabrous perennial from fibrous-rooted rhizomes. Stems prostrate or floating, hollow, 10–70 cm long. Leaves all cauline, petiolate, 3–15 cm long; the blades simple and suborbicular or pinnately compound with lanceolate to elliptic lateral lobes and a larger, usually cordate terminal segment. Petals white, 3–5 mm long. Fruit a linear silique, 8–18 mm long, 1.8–2.6 mm wide, flattened; style 0.3–1 mm long; pedicels spreading to ascending, 6–15 mm long, the lowest often in leaf axils (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range

Non-native
 


Range Comments
Introduced throughout temperate North America, native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 122

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Slow water of springs and (often spring-fed) creeks; valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Ecology
POLLINATORS
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).

Management

References
  • 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?
    • Craig, V.E. 1952. A story of fish production as it applies to Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 92 p.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Lainhart, R.D. 1973. Interaction of substrate particle size and other habitat variables, and their relation to the microdistribution of benthos in a Montana spring-stream. Ph.D. Dissertation. Bozeman, Montana: Montana State University. 124 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Marcoux, R.G. 1969. Fish populations in Big Spring Creek, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University
    • Rasmussen, S.M. 1968. Composition and structure of macrophyte vegetation of the Firehole River, Yellowstone National Park as related to physical and chemical factors. M.Sc. Thesis. Bozeman, MT: Montana State University. 44 p.
    • Tuinstra, K. E. 1967. Vegetation of the floodplains and first terraces of Rock Creek near Red Lodge, Montana. Ph.D dissertation. Montana State University, Bozeman 110 pp.
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Citation for data on this website:
Watercress — Rorippa nasturtium-aquaticum.  Montana Field Guide.  .  Retrieved on , from