Nasturtium 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.

Nasturtium 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.

Example:
What is the average leaf size and biomass of a grown Nasturtium?

Taxonomy
Nasturtium, flowers, leaves, plants, seed, Nasturtium flowers, orange, blossoms, Tropaeolum majus, colored flowers, Nasturtium officinale, spur, bright yellow, Jewel, colors, varieties, blooms, containers.

Defination from the web:
Nasturtium is the common name of Tropaeolum majus. ... it has a mustard oil similar to that produced by watercress (Nasturtium officinale, family Brassicaceae). Early English herbalists referred to nasturtiums as "Indian cress" after the conquistadors discovered them in the jungles ...