View photos of the edible and medicinal plant, Rubus flagellaris (Northern dewberry), profiled in the Wild Edible Series: Arkansas, Kansas, Louisiana, Missouri, Oklahoma, and Texas: Vol 1.

A passage from Wild Edible Plants of Texas (Vol 1):

When encountered they can be eaten fresh from the vine, or like Blackberry, processed into a jam, jelly, preserve, fruit spread, etc. They are sweet, just a bit tart, and dark–purple to black when fully ripe.

A passage from Wild Edible Plants of Oklahoma:

There are two Dewberry species native to Oklahoma – Rubus flagellaris (Northern dewberry) and Rubus trivialis (Southern dewberry). Both are common to central and eastern parts of the state.