Butterbur

It has reddish flowers with very large heart-shaped leaves with a furry gray underside. It possess an unpleasant smell that has been used for the treatment and preventative of the Black Death plague. 

Medical Uses
Immune system and cancer and tumor fighting properties: Take a few drops (2 to 10 drops) of a tincture preparation in a glass of water. 

Asthma treatment and Headache Treatment and prevention, an analgesic toothache relief, menstrual pain relief: Take 50 mg of butterbur extract twice daily for 3 months or longer. 
Hayfever and allergies prevention and treatment: Take 50 mg of butterbur extract twice daily for the period of the hayfever season. It’s said to be as effective as modern drugs. 

Cramps, Stomach Cramps, Spasms and Menstrual cramps, and wound healing with anti-inflammatory and anti-spasmodic effects: A decoction made from the leaf, flowers and root of this plant added to a warm or hot bath to soak externally the affected areas of the body will ease the cramps.