Which Nepenthes species is described as the most widespread in its genus?

Nepenthes mirabilis is described as the most widespread species in its genus.

Nepenthes mirabilis is a tropical pitcher plant whose range extends across continental Southeast Asia, the Malay Archipelago, and into northern Australia. It has been recorded from places including China, Thailand, Vietnam, Malaysia, Indonesia, the Philippines, New Guinea, and Cape York Peninsula. Most Nepenthes species have much smaller ranges, sometimes limited to one mountain or island.

Its pitchers are modified leaves that attract, trap, and digest prey. Slippery inner surfaces and digestive fluid make escape difficult, while the plant gains minerals from insects and other organisms that fall into the pitcher. Across its enormous range, N. mirabilis varies markedly in pitcher shape and colour.

That variation has complicated its taxonomy. The species has accumulated more synonyms than any other Nepenthes, and several named forms or varieties are no longer generally accepted as separate valid taxa. This broad distribution also distinguishes it from famous narrowly endemic species such as N. rajah and N. lowii. Nepenthes alata, another familiar cultivated pitcher plant, is not the genus’s most widespread species.