View photos of the edible plant, Vitis girdiana (Wild grape), profiled in Wild Edible Plants of California.

A passage from Wild Edible Plants of California:

Certainly, the grapes too make a fine jelly candidate. Though native species tend to be consistently sweet, occasionally they are a little acidic/acrid (irritating to the lips and mouth after eating a handful (or many handfuls).

View photos of the edible plant Vitis rotundifolia (Muscadine grape), profiled in Wild Edible Plants of Texas.

View photos of the edible plant Vitis arizonica (Canyon grape), profiled in Wild Edible Plants of Arizona and Wild Edible Plants of New Mexico.

A passage from Wild Edible Plants of Arizona:

Wild grape fails into two categories: plants that produce edible fruit and ones that produce non–edible fruit. I believe soil hydration and elevation are two important factors when evaluating Wild grape’s edibility. Lower–elevation/drier–growing Wild grapes usually produce fruits that are acrid. If eaten fresh, they will irritate the mouth and throat; not dangerous, but annoying.

A passage from Wild Edible Plants of New Mexico:

Common throughout the state, look for Wild grape along canyon bottoms and next to streams and intermittent drainages. Sometimes found at desert elevations (next to water), Wild grape is more predictably encountered in middle zones: 4000’–7000’.