Rhamnus
buckthorn, cascara
2 species
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Rhamnus alnifoliaalder-leaf buckthorn
Distribution: Occurring in the northeast corner of Washington; British Columbia east to Quebec, east of the Cascades to Idaho, Montana and the central Sierra Nevada of California.
Habitat: Moist ground, expecially along streams, at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-July
Growth Duration: perennial
Rhamnus catharticacommon buckthorn
Origin: Introduced