Tanglehead—_Heteropogon contortus_ Teddy bear cholla—_Opuntia bigelovii_ Texas bluestem—_Andropogon cirratus_ Triangle bursage—_Franseria deltoidea_ Turpentine-bush—_Haplopappus laricifolius_ Vine mesquite grass—_Panicum bulbosum_ Western yarrow—_Achillea lanulosa_ White fir—_Abies concolor_ White tackstem—_Calycoseris wrightii_ Wild carrot—_Daucus pusillus_ Wild-cucumber—_Marah gilensis_ Wild-heliotrope—_Heliotropium curassavicum_ Willow—_Salix sp._ Wolfberry—_Lycium sp._ Wolftail—_Lycurus phleoides_ Yellow paloverde—_Cercidium microphyllum_ Reptiles and Amphibians of the monument. This checklist names reptiles and amphibians that have been seen, or that should occur, according to range maps and distribution records in important reference works, in the monument. Four of these species are found only in the Tucson Mountain Section; they are: desert iguana, desert horned lizard, western shovel-nosed snake, and sidewinder. An asterisk marks those species most commonly seen in the daytime. The _desert_ (D) habitat is the rather flat or gently rolling terrain below 3,200 feet in elevation, as seen in the vicinity of the visitor center and the Cactus Forest Drive, and in the north and west portions of the Tucson Mountain Section. The _foothills_ (F) habitat includes the area above 3,200 feet where the land becomes quite rocky and begins to ascend rather sharply on the Cactus Forest Drive and along Hohokam Road in the Tucson Mountain Section. The _mountain_ (M) habitat is restricted to the Rincon Mountains above an elevation of 6,500 feet where one finds tall trees.