Botanical Overview
Butterbur (Petasites japonicus) belongs to the Asteraceae family. While not among the most extensively documented medicinal plants, this species has recorded uses that warrant attention from researchers and practitioners. The daisy family (Asteraceae) is one of the largest plant families, characterized by composite flower heads (capitula) that contain many small florets surrounded by bracts. Plants range from tiny alpine herbs to large tropical trees. The family includes many medicinally important species with bitter compounds and essential oils.
General Description
It is native to China, Japan, Korea and Sakhalin and introduced in Europe and North America. It was introduced to southern British Columbia in Canada by Japanese migrants. It is dioecious, with male and female flowers produced on separate individuals. Occasionally, morphologically hermaphroditic (but functionally sterile) flowers exist.
Family Context
The Asteraceae family is extremely large and diverse. Notable medicinal members include:
- Yarrow — 63 documented uses
- Gobo — 63 documented uses
- Mugwort — 55 documented uses
- Sunflower — 52 documented uses
Geographic Distribution
Butterbur has been recorded in 10 countries and territories worldwide, including Canada, Denmark, Finland, France, United Kingdom, and others.
Traditional Uses
Butterbur has been traditionally used for respiratory conditions.
Respiratory conditions.
- Expectorant
Respiratory conditions are addressed through steam inhalation of the herb’s vapors or internal use as a warm tea. The hot infusion acts as an expectorant, helping to loosen phlegm and clear congestion. Some traditions combine it with honey for coughs.
Active Compounds
Phytochemical research has identified 30 compounds in this species, including a diverse array of phytochemical classes (see the Complete Chemical Inventory below for the full list).