Some favorites include yerba santa (Eriodictyon californica), mullein (Verbascum thaspis), wild cherry bark (Prunus virginiana or P. serotina), and Lobelia inflata.    From Wordnik.com.  [THE NATURAL REMEDY BIBLE] Reference

Yerba santa Eriodictyon californica is an old-time remedy of the Pacific Northwest that has a longtime, cherished reputation for the treatment of all upper respiratory complaints, including bronchitis.    From Wordnik.com.  [THE NATURAL REMEDY BIBLE] Reference

Other native American herbs that serve as expectorants include yerba santa (Eriodictyon californica), grindelia grandiflora, balm of Gilead (Populus balsamifera and P.candicans), polygala senega, sundew (Drosera rotundiflora), lobelia seed or leaf tincture (L. inflata), boneset (Eupatorium perfoliatum) and pleurisy root (Asclepias tuberosa).    From Wordnik.com.  [THE NATURAL REMEDY BIBLE] Reference