Rhamnus betulaefolia (Birchleaf Buckthorn) is a shrub or small tree of the Rhamnaceae family, the buckthorns. It is native in Northern Mexico in the Sierra Madre Occidental cordillera, and mountainous, desert regions of the Southwestern United States of Arizona, Utah, New Mexico, and far west Texas; besides being found in Sonora, Chihuahua and Dur...