Smaller communities include stands of Lacey Oak (Quercus laceyi), Pecan (Carya illinoinensis)-Sugarberry (Celtis laevigata) groves, and Gramagrass-Switchgrass (Panicum virgatum) grasslands, as well as fields of Sotol (Dasylirion wheeleri).
PMV was identified in 1953, and is known to infect switchgrass, centipedegrass and St. Augustine Grass.
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It was originally noted to infect switchgrass (Panicum virgatum), and was observed infecting St. Augustine Grass (Stenotaphrum secundatum) in Texas in 1966.