[2] According to a leading expert, Professor James L. Reveal of the University of Maryland, its Kentucky population has been reportedly extirpated.

[3] Its 2006 Alabama Natural Heritage Program ranking was G4T2S1, demonstrating an opinion that it was "critically imperiled" in that state.

and false aloe (Manfreda virginica) in an upland calcareous cliff plant community.

Their foothold is attributed to human removal of competitors to allow a better view of the Tennessee River from one of the buildings on the property.

This plant community is home to many other rare and endangered plants including Alabama glade cress (Leavenworthia alabamica), Alabama larkspur (Delphinium alabamicum), glade quillwort (Isoëtes butleri), lyrate bladderpod (Paysonia lyrata),[6] Nashville breadroot (Pediomelum subacaule), prairie Indian plantain (Arnoglossum plantagineum), Tennessee milk vetch (Astragalus tennesseensis), and yellow sunnybell (Schoenolirion croceum).