It especially likes the fruit of cacti such as the prickly pear. Native species include buckwheat and prickly pear. The color red comes from the cochineal bug found on the prickly pear cactus. Edible plants such as wild asparagus and prickly pear are occasionally found. Their territory also produced a great quantity of prickly pear. Exceptions include lantana, rubber vine, and prickly pear. These included seeds of wild grapes, elderberries and prickly pear fruit, often in large quantities. Introduced plants that have caused widespread problems are lantana and the prickly pear bush. Factors that limit the growth of prickly pear are rainfall, soil, atmospheric humidity and temperature. Several of the men died on this expedition from eating prickly pear. Common names include erect prickly pear and nopal estricto (Spanish). The juice from the prickly pear cactus leaf pads will serve many functions. Varieties of cactus include the edible prickly pear. Most culinary references to the "prickly pear" are referring to this species. Reportedly, the winds even ripped spines from prickly pear cacti.