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Montana Field Guide

Montana Field Guides

Watercress - Rorippa nasturtium-aquaticum
Other Names:  Nasturtium officinale

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

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

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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
Unknown/Undetermined
 


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

Summary of Observations Submitted for Montana
Number of Observations: 4

(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).

References
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Citation for data on this website:
Watercress — Rorippa nasturtium-aquaticum.  Montana Field Guide.  .  Retrieved on , from