Botanical name: 

CHARA, L. Water Feathers. Aquatic plants, with a fetid smell, said to be antispasmodic and vermifuge. They contain a peculiar substance, Charine, similar to animal matter, a fetid green oil, and many salts, chiefly carbonate of lime, produced by crustaceous Polyps covering the plants.

Medical Flora, or Manual of the Medical Botany of the United States of North America, Vol. 2, 1830, was written by C. S. Rafinesque.