Some of the globally imperiled plants found in the area include Torrey's mountain mint (Pycnanthemum torrei) and basil-leaved mountain mint (Pycnanthemum clinopodioides), which, along with narrow-leaved vervain (Verbena simplex), are also classified as endangered by the state.
Seven state-listed endangered plant species call the Preakness Range home, including a globally endangered species, Torrey’s mountain mint (Pycnanthemum torrei).
The park is known to contain at least one globally imperiled plant, Torrey's mountain mint (Pycnanthemum torrei), as well as three other plants endangered within New Jersey.