Prunus gracilis

Prunus gracilis, called the Oklahoma plum, sour plum, and sand plum, is native to the south-central United States (eastern New Mexico, southeastern Colorado, Texas, Oklahoma, Kansas, southwestern Arkansas, northwestern Louisiana).

Gracilis refers to 'slender branches'. Prunus gracilis grows up to 6 ft (1.8 m) tall, has five-petaled leaves, and fruits ripen June-August. Its red fruits are considered poor for eating, but Native Americans dried them for consumption during winter. It grows in clusters and thickets.