If you recall the several densely bushy, spiny members of the Buckthorn Family, the Rhamnaceae, we saw in the Oregon mountains last summer it might be hard for you to visualize the plant in the picture as belonging to the same family. It does, however. It's COLUBRINA GREGGII, native from southern Texas south through Mexico at least into Guatemala.

Its presence in Texas explains its having an English name, though I can't figure out what is naked about it. Several species are referred to as nakedwoods, and this one often is called Sierra Nakedwood, but that makes no sense here. The Maya here say that they don't use the tree for anything and that only the birds care for the fruits

But surely the shrub is most noteworthy simply as a fully engaged member of the local ecosystem. A few weeks ago when its tiny, yellow-green flowers were blossoming I saw them buzzing with honeybees taking both nectar and pollen. Many other insects, especially butterflies and diurnal moths were attracted as well, which in turn attracted bug-eating birds, especially vireos, flycatchers and migrating warblers.