ragweed

In much of the area, a mixed shrub plant community prevails, including species like the foothills palo verde (Cercidium microphjyllum), triangle-leaf bursage, and bush (Encelia farinosa).

Finally, one Baja bursage (Ambrosia bryantii) has characteristics that make it seem more like a cactus than a woody shrub.

Much of the native vegetation that pronghorn graze, such as dune bursage, mistletoe, and mesquite leaves, is fading away at an accelerated pace, giving way to parched earth and scrub.

And with 18 different species (some known as bursage), North America is the epicenter of ragweed.

Most observations in Arizona occurred in habitats with herbaceous or bare ground understories, and the animals were infrequent in areas dominated by creosote, triangle-leaf bursage (Ambrosia deltoidea), saltbush (Atriplex polycarpa), or other shrubs (Table 2).

It is often a dominant herbaceous species found below 5,000 feet in Coleogyne and creosote bush-white bursage (Larrea tridentata-Ambrosia dumosa) shrublands of southern Nevada (Beatley 1966; Newman 1991).

Much of the native vegetation that pronghorn graze, such as dune bursage, mistletoe, and mesquite leaves, is vanishing at an accelerated pace, giving way to parched earth and shrub.

Annual precipitation is often less than 10 centimeters (4 inches) and summer temperatures frequently soar to 43 degrees Centigrade (110 degrees Fahrenheit) or more in this baked landscape of sandy plains, scattered dunes, and sparse, simple vegetation communities dominated by creosote (Larrea divaricata), white bursage (Ambrosia dumosa), and galleta grass (Hilaria rigida).

These shrub species were Shockley's goldenhead (Acamptopappus shockleyi), white bursage (Ambrosia dumosa), shadscale (Atriplex confertifolia), Nevada ephedra (Ephedra nevadensis), winterfat (Krascheninnikovia lanata), range ratany (Krameria erecta), and creosote bush (Larrea tridentata).