Frangula purshiana

Frangula purshiana

Frangula purshiana, commonly known as Cascara Sagrada, is a species of buckthorn native to western North America. It is a deciduous shrub or small tree that can grow up to 10 meters tall.

Description

The leaves of Frangula purshiana are simple, 5–15 cm long and 2–5 cm broad, with a serrated margin. The flowers are tiny, 4–5 mm diameter, with five greenish-yellow petals. The fruit is a drupe 6–10 mm diameter, bright red at first, quickly maturing deep purple or black, and containing a single seed.

Distribution and habitat

Frangula purshiana is native to western North America, from southern British Columbia south to central California, and eastward to northwestern Montana. The plant prefers moist, well-drained soil, and can be found in the understory of coniferous forests.

Uses

The dried bark of Frangula purshiana has been used for centuries by Native Americans as a laxative. Today, it is used in the pharmaceutical industry for the same purpose.

Cultivation

Frangula purshiana can be propagated by seed or by cuttings. It is a hardy plant that can tolerate a range of soil types and conditions, but prefers a sunny location.

Conservation status

While Frangula purshiana is not currently listed as threatened or endangered, habitat loss and overharvesting for its medicinal bark have led to declines in some areas.

See also

• List of plants used in herbalism
• Medicinal plants