The plants on this list have been proposed for inclusion on the "At Risk" list, but require further research. United Plant Savers is watching these herbs and collecting information on the levels of commercial usage and monitoring the viability of these plants within their current range.

Arnica (Arnica spp.)
Butterfly Weed (Asclepias tuberosa)
Cascara Sagrada (Rhamus purshimia)
Chaparro (Castaela emoryi)
Elephant Tree (Bursera microphylla)
Gentian (Gentiana spp.)
Goldthread (Coptis spp.)
Kava Kava (Piper methysticum) (Hawaii only)
Lobelia (Lobelia spp.)
Maidenhair Fern (Adiantum pendatum)
Mayapple (Podophyllum peltatum)
Oregon Grape (Mahonia spp.)
Partridge Berry (Mitchella repens)
Pink Root (Spigelia marilaandica)
Pipsissewa (Chimaphila umbellata)
Spikenard (Aralia racemosa, A. californica)
Stream Orchid (Epipactis gigantea)
Turkey Corn (Dicentra canadensis)
White Sage (Salvia apiana)
Wild Indigo (Baptisia tinctoria)
Yerba Mansa (Anemopsis californica)

Please see the "herb analogues section (linked above) for alternatives to some of these threatened herbs.