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Today we have Hydrastis canadensis or Golden-seal. It is also called Yellow Root around here. It was made know to us by the Cherokee Tribe and was listed as an official drug until about the mid 20th century. Increasing scarcity in the wild may have been the reason for taking it off the list. It was widely distributed in rich woods and was grown commercially here in Ohio at one time.
The roots which are definitely very yellow, have been used as a dye. To use this plant, they dried and powdered the root (hence the problem with wiping out the wild colonies as is was difficult to sustainable harvest it). The powder would then be dissolved in boiling water. It was used as a tonic. It was reported that the Native Americans used it for ulcers and arrow wounds. An older reference stated that it could be used for "dyspepsia, erysipelas, remittent, intermittent and typhoid fevers, torpor of the liver, ophthalmia, ulceration of the mouth and spermatorrhea."
Another source says "it may be given alone or in combination with other suitable medicines and it promotes digestion, improves the appetite and acts as a general stimulant to the system. In convalescence it is highly beneficial." That is more along the lines of how I have heard of it being used.
It is a lovely plant for the shade garden and blooms in late spring or early summer. The clump is slowly spreading and reliably comes back every year, just a little larger. It is about a foot tall and each stem has one leaf and one bloom.
Jane