Tahoe Yellow Cress .org: As recently as 1996, this unique member of the mustard family teetered on the brink of extinction when it disappeared from beaches in Nevada and was found growing in less than 10 sites on the California side of the lake.

[Wikipedia] Limited Range, Negative Human Impacts: It is known only from the shores of Lake Tahoe, straddling the border between California and Nevada. There are an estimated fourteen populations of the plant still in existence.[3] It grows only on the direct shoreline of the lake, occupying a seven-foot semi-aquatic zone between the high- and low-tide marks.[3] It is directly impacted by recreational activities on the lake, enduring bombardment by boat wakes, trampling, and construction of docks and other structures. (link added by Mary Ann Machi)