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[edit]

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[edit]

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[edit]

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[edit]

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[edit]

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.