Nasturtium officinale W. T. Aiton
Nasturtium nasturtium-aquaticum (L.) Karsten
Rorippa nasturtium-aquaticum (L.) Hayek
Sisymbrium nasturtium-aquaticum L.
- Occurrence in Alberta – Yes
- Global Invasive Species Database –
- NatureServe Rank –
- Haber, Upland –
- Haber, Wetland –
- CWF, Status & Invasive Range –
- Alberta Revegetation Guidelines –
- The Nature Conservancy –
- CBCN –
- AB Weed – No
Very persistent but perhaps slow spreading where introduced in streams. Does well in quiet streams and shallow water.
Edible: available commercially, outside of cultivation take care to avoid polluted water---if you would not drink the water, don't eat the watercress. Chlorinate and wash prior to eating.
 Link to Wikipedia, Watercress - "...In some regions, watercress is regarded as a weed, in other regions as an aquatic vegetable or herb. Watercress has been grown in many locations around the world..."
 Link to USDA Plants Profile for Nasturtium officinale W.T. Aiton watercress
 Link to Bugwood.org wiki page for Nasturtium officinale/NJ
Try Google Images: 
Szczawinski & Turner, Edible Garden Weeds of Canada, ISBN 0-88902-752-8
sample: Map data for T. ramosissima