Shepherdia argentea (silver buffaloberry or bull berry, thorny buffaloberry) is a species of Shepherdia, native to central North America from southern Canada (Alberta, Saskatchewan, Manitoba) south in the United States to northern California and New Mexico.
It is a deciduous shrub growing to 2–6 m tall. The leaves are arranged in opposite pairs (rarely alternately arranged), 2–6 cm long, oval with a rounded apex, green with a covering of fine silvery, silky hairs, more thickly silvery below than above. The flowers are pale yellow, with four sepals and no petals. The fruit is a bright red fleshy drupe 5 mm in diameter; it is edible but with a rather bitter taste.
The berry is one of the mainstays of the diet of the Sharp-tailed Grouse, the provincial bird of Saskatchewan.
Thanks to wikipedia.org