Which species is commonly used as watercress?

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broccoli — Brassicales Broccoli (*Brassica oleracea*, variety *italica*).

The species commonly used as watercress is Nasturtium officinale, which is also referred to as Rorippa nasturtium-aquaticum.12

A member of the mustard family (Brassicaceae) within the order Brassicales, this perennial aquatic plant is native to Eurasia and has been naturalized in North America. It is prized for its edible young shoots and peppery-flavored leaves, which are rich in vitamin C. It is important to note that the garden ornamental nasturtium (genus Tropaeolum) is not closely related to watercress.1