Gambel's Water Cress [Rorippa gambellii (S. Wats.) Roll. & Al-Shehbaz]

Gambel's Water Cress [Rorippa gambellii (S. Wats.) Roll. & Al-Shehbaz]

Listing CNPS List 1B R-E-D Code 3-3-2

State/Federal. Status CT/FE BRASSICACEAE Apr.-Jun.

Global Rank G1 State Rank S1.1

Distribution: San Diego County ?, San Luis Obispo County; Baja California, Mexico

Habitat: Marshes, swamps, and the borders of lakes are the reported habitat of this herbaceous perennial.

Known Sites: No recent San Diego County sightings are known. An odd historical report from near Pine Hills southwest of Julian should be relocated/reexamined to verify its occurrence. Hoover reports it as in San Luis Obispo County among the dunes from Oceano southward. Smith reports the type collection from near Santa Barbara; also Oso Flaco Lake in San Luis Obispo County. Data Base reports from San Luis Obispo County are for the southwest and northeast of the causeway and south edge of Oso Flaco Lake, near small twin lakes south of Arroyo Grande, on the south and north edge of Little Oso Flaco Lake, near Black Canyon Lake between Sheridan Road and the end of Callender Road; in San Bernardino County near Urbita Hot Springs in the San Bernardino Valley (likely extirpated); and a vague 1904 report from Cienaga in Los Angeles County.

Status: The status of Gambel's Water Cress in San Diego County is unknown. The lone report may be a misidentification, or mislabeled locality. Any legitimate native population in Southern California should be protected.


Copyright May 1994 Craig H. Reiser.

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