Pussy-willow

Salix nigra, the pussy willow, grows along streams in the Southern states. It was used in the late 19th century as a sexual sedative. ... 

As a result of his observations of Nature, Edward Stone (1702-1768), a curate from Chipping Norton in Oxfordshire, used willow bark in 1763 to treat more than 50 patients with malaria. In 1792, the physician Samuel James (1763-1831) used the bark of goat willow (or pussy-willow , Salix caprea) to reduce fever. Stones work first found general recognition in Nicholas Culpeper s Complete Herbal, in the edition of 1802, and willow bark was acknowledged thereafter as... 

Part used is the flower bud collected before opening in early spring and carefully sun or oven dried. The dried bud measures 1-5 cm long and has a diameter of 0.5-2 cm at midsection, depending on the source." It is hairy and its overall appearance resembles that of a pussy willow bud, but it emits a strong characteristic eucalyptus-like odor when crashed. 

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