Yellow wild indigo

Used as a herbal remedyin the treatments of colds and flu. The root contains alkaloids, which may contribute to its medicinal actions.
It also can stimulate the immune system, it has been applied as an herbal remedy in the treatment of common colds, sore throats, infections and influenza.
It has also been found to be of use in the treatment of infections of the ear, nose and throat. It can be helpful as a treatment for laryngitis, tonsillitis, pharyngitis and catarrhal infections of the nasal and sinus passages. When wild indigo is used for the treatment of infections it will commonly be used in conjunction with echinacea and myrrh. If it is a lymphatic problem, then typically it will be combined with cleavers and poke root.
It can help to heal ulcers in the mouth, gingivitis and help in the control of pyorrhea
There has been some use of wild indigo as a systemic treatment for enlarged and inflamed lymph glands and also to reduce fevers