Nasturtium

1. (n.) A genus of cruciferous plants, having white or yellowish flowers, including several species of cress. They are found chiefly in wet or damp grounds, and have a pungent biting taste.
2. (n.) Any plant of the genus Tropaeolum, geraniaceous herbs, having mostly climbing stems, peltate leaves, and spurred flowers, and including the common Indian cress (Tropaeolum majus), the canary-bird flower (T. peregrinum), and about thirty more species, all natives of South America. The whole plant has a warm pungent flavor, and the fleshy fruits are used as a substitute for capers, while the leaves and flowers are sometimes used in salads.