It is also found in nurseries in eastern Canada, but has been recorded in all of the southern provinces. Most recently it has been found in two locations in California. A second species R. palustris is also found in California. This species has also been confused with R. slandica. This species can be found in wet areas below 2000 feet elevation and in irrigated shade houses.
Leaves are finely divided and resemble a watercress leaf from which it is closely related.
It has a small yellow flower and flower stalks appear to be 6 to 12 inches in height. It has a shallow rhizome that rapidly initiates new shoot or a deep rhizome that has been found to 36 inches. Plant material can be propagated many ways. It has been reported to be able to grow roots from leaves floating on a water surface. It has propagated from 1.5 to 3 cm rhizome pieces routinely when planted from material harvested outside and planted in the greenhouse.