[3][4] These plants are related to garden cress and mustard, noteworthy for a peppery, tangy (pungent) flavor.

The name Nasturtium comes from the Latin nasus tortus, meaning "twisted nose", in reference to the effect on the nasal passages of eating the plants.

Nasturtium foliage is used as food by the caterpillars of certain Lepidoptera, including Orthonama obstipata (The Gem).

Though not closely related, the leaves of the garden nasturtium also have a peppery taste.

As of June 2022[update], Plants of the World Online accepts the following species and hybrids:[1] Plants of the World Online regards Nasturtium africanum as a synonym of Rorippa africana.