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Benjamin Carroll Tharp of the prevailing southeast wind, post oak, blackjack and hickory are found in the tall growth-habit characteristic of them in extreme East Texas and Louisiana. A dense stand of these tall slender individuals within a stone's throw of the scrub growth of the same species on the exposed wind swept sides of Enchanted Rock gives startling evidence of the combined effects upon the form and appearance of vegetation of wind, evaporation and of scant versus abundant soil moisture.

Grasses of this region include-among others-sage, or bluestems, dropseeds, triple-awn, needle and grama grass. In the tighter soils are found the buffalo, and perhaps the curly mesquite grass. Flowering herbs are: mustards, mints, morning-glories, poppies, four o'clocks, Phlox, evening primroses, Oxalis, mallows, milkweeds, spurges, bluebells, cucurbits, Coreopsis, dayflowers, Tradescantias, bladderworts, plantains, gentians, daisies, asters, sunflowers, firewheels, nightshades, and numerous others.