[Watercress: The Genus Nasturtium East of the Cascade Mountains of Oregon and Washington]

Watercress

Nasturtium officinale

Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum

Watercress: Nasturtium officinale (Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum)

Watercress in a moist drainage below a spring along the Box Canyon Road, Simcoe Mountains Unit of the Klickitat Wildlife Area.........July 1, 2020.

Characteristics:

Watercress is an aquatic or subaquatic perennial with creeping stems from 10-60 cm long and which are often found floating. The stems are succulent, glabrous and they often root at the nodes. The glabrous leaves aer pnnate and measure 4-12 cm long. The 3-11 segments are ovate to lanceolate in shape with the larger terminal lobe lanceolate, ovate or heart-shaped.

The racemes are short and corymb-like in flower and elongate in fruit. The pedicels measure 8-20 mm long and are spreading recurved or ascending. The sepals are white while the whitish petals are broadly spatulate and measure 3-4 mm long. They often purplish-veined or tinged. The fruits are arched, spreading siliques that measure 10-20 mm long and about 2 mm wide.

Watercress is often used as a tasty salad green.


Habitat:

Watercress is found in slow moving water in streams, ditches and canals.


Range:

Native to Europe, watercress may be found across much of North America.


Flowers of Watercress: Nasturtium officinale (Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum)

This photo shows a close-up of the flowers of watercress as seen in a pond at the Dalles Mt. Ranch in the Columbia Hills State Park of south-central Washington.........June 8, 2008.

Seed pod of Watercress: Nasturtium officinale (Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum)

This photo shows a close-up of the developing seed pod of watercress as seen in a pond at the Dalles Mt. Ranch in the Columbia Hills State Park of south-central Washington.........June 8, 2008.

Inflorescence of Watercress: Nasturtium officinale (Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum) - Flowers of Watercress: Nasturtium officinale (Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum)

Close-up images of the inflorescence of watercress as seen in a pond at the Dalles Mt. Ranch in the Columbia Hills State Park of south-central Washington..........June 8, 2008.

Watercress: Nasturtium officinale (Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum) - Watercress: Nasturtium officinale (Synonyms: Rorippa nasturtium-aquaticum, Sisymbrium nasturtium-aquaticum)
These 2 photos show watercress as seen in a pond at the Dalles Mt. Ranch in the Columbia Hills State Park of south-central Washington.........June 8, 2008.

Paul Slichter