Watercress
Nasturtium officinale

Family: Mustard (Brassicaceae)
AKA:
Photo taken on: June 10, 2007
Location: Cement Creek Road, GV, CO
Life Zones: Plains to montane
Habitat: Water, wet soil, springs

Grows with floating, trailing, fleshy hollow stems. Tiny flowers float on stems above the water. Its peppery leaves are edible.

Flora of North America reference.