Found in moist habitats such as the banks of ponds or streams and swamps in North America, Europe, and Asia. Calamus has been used as a remedy for digestive upsets, colic, fever, and dyspepsia. It was once used as a flavoring agent in tooth powders, tonics, beer, and bitters. It is free of carcinogenic isoasarone, while Types II, III, and IV are not suitable for any human use due to the presence of this constituent.
More research is necessary.
Calendula is a common cultivated ornamental with orange or yellow flowers, also referred to as pot marigold or garden marigold. It should not be confused with members of the genus Tagetes, which are also widely grown and commonly called marigolds. Widely grown in gardens in the United States and Europe. During its long history, calendula has been administered internally for a variety of ailments, including spasms, fevers, suppressed menstruation, and cancer. Its chief use, however, was to help heal and prevent infection of lacerated wounds.