Nothing characterizes the parched Sonoran Desert more powerfully than the giant saguaro cactus. This spiky native of southern Arizona and northern Mexico can grow to a height of 60 feet and live for more than 200 years. Its "arms" which seem to bend at the elbow to wave a greeting (or maybe a farewell) to travelers, can number up to 50. The giant saguaro evokes wonder rather than casual interest.
What does parched most likely mean as it is used in the paragraph above?