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Nasturtium officinale.  (Watercress)
Brassicaceae (Mustard Family)

Semi-desert, foothills, montane. Springs, streams. Summer.
Bill Canyon, April 1, 2004.

Watercress was introduced from Europe and is now quite at home throughout the United States -- even in grocery stores.  Its tiny white flowers (not shown) float on stems just above the water.  The plant has a pleasant peppery taste but it can be unsafe to consume wild plants because of contaminated water.

"Nasturtium" is apparently from the Latin "nasus tortus", "twisted nose", referring to the contortions caused by the sharp, peppery smell of its seeds.  "Officinale" is Latin for "of the shops", basically meaning that it has at some time been accepted as an official herb/drug. 

Nasturtium officinale (Watercress)
Brassicaceae (Mustard Family)

Semi-desert, foothills, montane. Springs, streams. Summer.
Bill Canyon, April 1, 2004.

In 1753 Linnaeus named this species Sisymbrium nasturtium-aquaticum and in 1812 the botanist Robert Brown renamed it Nasturtium officinale.