Lepechinia rossii is a rare species of flowering plant in the mint family known by the common name Ross' pitcher sage.

It is endemic to the Transverse Ranges of California on the north edge of the Greater Los Angeles Area.

The leaves have toothed or serrated oval blades measuring up to 13 centimeters long.

The inflorescence is an open raceme of flowers with large, leaflike bracts at the base.

Threats to this rare species include off-road vehicles, power line maintenance activity, petroleum drilling and exploration, introduced plant species such as brome grasses, and alterations in the fire regime in the southern California chaparral where it grows.