What is the name of the broad expanse of flat land in the western United States and western Canada  where the species of plant called the Polygonum sawatchense of the buckwheat family be found?
Great Plains The Great Plains (sometimes simply "the Plains") is the broad expanse of flat land (a plain), much of it covered in prairie, steppe and grassland, that lies west of the Mississippi River tallgrass prairie states and east of the Rocky Mountains in the United States and Canada. It embraces
Eriogonum brachypodum Eriogonum brachypodum is a species of wild buckwheat known by the common name Parry's buckwheat. This annual herb is native to the southwestern United States from California to Utah, especially the Mojave Desert, where it grows in sandy and gravelly substrates. It has a skeletonlike spindly stem which branches many times, reaching anywhere from 5 to 50 centimeters in height and up to a meter in width. There is an array of rounded, dark-colored leaves around the base, each a few centimeters long and fuzzy on the undersides. Most of the plant is actually the spreading inflorescence. At intervals on the otherwise naked branches hang tiny clusters of glandular flowers a few millimeters wide in involucres of bell-shaped bracts. Each flower is less than three millimeters wide.