Ask Mr. Smarty Plants

Mr. Smarty Plants checked the USDA Plants Database for Prunus (plum) and Pyrus (pear) species growing in Houston County but there were none given.  This doesn't necessarily mean that no species of either of these genera occur in Houston County. Here is what the USDA Plants Database says on the subject of distribution data on its Advanced Search and Download page:

"Regardless of source, county distribution data are notoriously incomplete and can only be considered preliminary. For a broader idea of what may grow spontaneously in a particular county you may want to include adjacent counties that are phytogeographically similar in your search."

In adjacent counties, however, there were:

• Prunus angustifolia (Chickasaw plum) grows 15-30 feet tall and has been found in Cherokee, Trinity, Madison and Leon Counties.
• Prunus mexicana (Mexican plum) grows 15-35 feet tall and has been found in Angelina, Trinity, Walker and Madison Counties.
• Prunus umbellata (Hog plum) grows from 12-20 feet tall and has been found in Trinity County.

In adjacent nearby counties of Robertson and Brazos Pyrus communis (Common pear), introduced from Europe and Asia, has been reported as can be seen on the USDA Plants database distribution map.

Pyrus calleryana (Callery or Bradford pear), with origins in China and Vietnam, has been introduced into Texas but no county data is available according to the distribution map from the USDA Plants Database.  The Bradford cultivar has been a very popular landscape tree.

If the flowering trees look as if they have been planted (i.e., they are regularly spaced and approximately the same size), then I would suspect that they are one of the two introduced pear species.

If the flowering trees are not all the same size and if they aren't regularly space, I would think that they are one of the three native plum species named above.