Rorippa nasturtium-aquaticum
- Description of Two-rowed Watercress, also classified as Nasturtium officinale, and a photograph.
- http://www.plant-identification.co.uk/skye/cruciferae/nasturtium-officinale.htm

Rorippa microphylla
- Two photographs of the One-rowed Watercress, also known as Nasturtium microphyllum, with its description.
- http://www.plant-identification.co.uk/skye/cruciferae/nasturtium-microphyllum.htm