Claim: The cliffdweller (a monotypic plant genus in the family Brassicaceae - a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family) is a plant found in multiple areas in California where it grows on rocky mountainsides and sprouts from cliffs, producing seeds that are borne in cylindrical fruits.
Evidence: Caulostramina is a monotypic plant genus in the family Brassicaceae containing the single species Caulostramina jaegeri, which is known by the common name cliffdweller. Brassicaceae (/ˌbræsɪˈkeɪsii/) or Cruciferae (/kruːˈsɪfəri/) is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. The cliffdweller is a rare plant endemic to Inyo County, California, where it is found only in the White and Inyo Mountains. This plant grows on rocky mountainsides and sprouts from cliffs. The seeds are borne in cylindrical fruits.