Klamath plum Rosaceae Prunus
Leaf: Alternate, simple, deciduous, broadly ovate to oval, from 1 to 3 inches long, serrated or doubly serrated margins, small yellow-green glands on basal serrations or petiole, green above and paler below.
Flower: Perfect, small, white; borne in a loose, rounded cluster.
Fruit: An oblong drupe, 1/2 to 1 1/4 inches long; yellow, dark red, or purple when mature; large single seed is ridged on one side, edible.
Twig: Slender, round, and smooth; eventually dark reddish brown with conspicuous lenticles; spur shoots are common on older twigs and commonly resemble thorns.
Bark: Thin (about 1/4 inch), grayish brown, and tending to break into fissures and scaly plates.
Form: A thicket-forming shrub or small tree, sometimes reaching 25 feet tall.
Looks like: choke cherry - bitter cherry - Oregon crabapple