Desert Peppergrass (Lepidium fremontii) is often also called Desert Alyssum.
Mystery Cairn Peak and Vista Peak are visible in the background.
Lake Mead Area, Nevada. March 2008.
Desert Peppergrass is a shrub that can be found at elevations up to 4,000 feet. Its leaves are long and narrow. Its white flowers appear in spring and have four petals.