What is the approximate number of species in the genus Nepenthes?

The approximate number of species in the genus Nepenthes is about 170.

Nepenthes is the genus of tropical pitcher plants, also called monkey cups. Its recognised species count changes as botanists describe newly discovered plants and revise classifications, so “about 170” is more appropriate than an exact permanent total.

The genus is native mainly to Southeast Asia, with its greatest diversity on Borneo, Sumatra, and the Philippines. Species range from lowland plants in hot, humid forests to montane plants adapted to cool nights. Their pitchers are modified leaves that trap insects and other small animals in digestive fluid.

A common mix-up is confusing the number of Nepenthes species with the much larger number of cultivated hybrids and forms. Natural hybrids are also widespread, but they are not usually counted as separate species. The total therefore depends on whether a source is discussing valid species, hybrids, or undescribed plants.