Botanical name:
17. EQUISETUM.—SCOURING RUSH. The herb of Equise'tum hyema'le Linné. Habitat: Northern United States. Diuretic and astringent. Dose of fl'ext.: 15 to 60 drops (1 to 4 mils).
Henriette's Herbal Homepage
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Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.