View photos of the edible plant Sideroxylon lanuginosum ssp. oblongifolium (Gum bumelia), profiled in Wild Edible Plants of Texas.

A passage from d in Wild Edible Plants of Texas:

Begin looking for the berries in the late summer. As the season progresses to fall the immature berries will begin
to ripen and darken in color. When fully ripe they’ll be purple–black, oval, and about the size of a large pea.

View photos of the edible plant Sideroxylon lanuginosum ssp. rigidum [Bumelia lanuginosa ssp. rigida] (Gum bumelia), profiled in Wild Edible Plants of Texas.

A passage from Wild Edible Plants of Texas:

The fruit’s mesocarp/exocarp, which surrounds the seed, is the edible part. It is thin (like Sugarberry) but pleasant
tasting and sweet. The large seeds can be chewed and eaten, however they are poor tasting (bitter). I usually spit them out.