If you want to underscore just how commonly found and present something is within a particular place, try the word endemic. The saguaro cactus is endemic, or native, to the American southwest — so watch out for its sharp spines when you're hiking in Arizona!
Although endemic meaning "prevalent" often describes a plant or disease, it can also refer to something less tangible and more unwanted such as violence or poverty. Many complain of endemic corruption in the local government. Despite its -ic ending, endemic can also be used as a noun to signify a plant or animal that is prevalent in a certain region. If an endemic is brought to another area which it takes over, destroying the local population, it's classified as an invasive species.