Rhamnus
buckthorn, cascara
2 species
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Rhamnus alnifolia – alder-leaf buckthorn
Distribution: Occurring east of the Cascades crest in northeastern Washington; British Columbia to California, east across Canada and the northern half of the U.S. to the Atlantic Coast.
Habitat: Moist ground, expecially along streams, at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
Distribution: Occurring east of the Cascades crest in northeastern Washington; British Columbia to California, east across Canada and the northern half of the U.S. to the Atlantic Coast.
Habitat: Moist ground, expecially along streams, at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
Rhamnus cathartica – common buckthorn
Distribution: Occurring east of the Cascades crest in Washington; Washington to Montana, east across the Rocky Mountains and Great Plains to the Atlantic Coast.
Habitat: Roadsides, wastelots, and other disturbed areas near gardens, where escaping from cultivation.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Annual
Distribution: Occurring east of the Cascades crest in Washington; Washington to Montana, east across the Rocky Mountains and Great Plains to the Atlantic Coast.
Habitat: Roadsides, wastelots, and other disturbed areas near gardens, where escaping from cultivation.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Annual
