Plate 1. Although generally occurring in well-spaced clumps, woody vegetation becomes dense along dry drainages in the Rio Grande Plain. Such areas are slow to recover from root-plowing. Chaparral Wildlife Management Area's boundary with Light Ranch, area to left, shows effect of shrub removal 12-15 years previously.

Plate 2. Drought and over-grazing near Chaparral Wildlife Management Area. Dimmit Co., Texas. May 1978.

Plate 3. Fertile zones around mesquite clumps are indicated by size and color of horse mint (Monarda) growing near clump (Chaparral Wildlife Management Area, May 1979).

Plate 4. Shrub clump containing Celtis pallida and Opuntia lindheimeri. R.H. Whittaker, Chaparral Wildlife Management Area, March 1977.

Plate 5. Lichen on bark of dead Celtis pallida stem gradually contributes to litter under shrub clump. Chaparral Wildlife Management Area.

Plate 6. Termite casting built over grass blades. Chaparral Wildlife Management Area, May 1978.