Who is honored by the name Nepenthes rajah?

Nepenthes rajah honors James Brooke, the first White Rajah of Sarawak.

The species was collected on Mount Kinabalu by Hugh Low in 1858 and formally described the following year by the botanist Joseph Dalton Hooker. Hooker chose the name rajah to honor James Brooke, the British adventurer who ruled Sarawak as its first White Rajah. The plant is therefore also known as Rajah Brooke’s pitcher plant.

Nepenthes rajah is endemic to Mount Kinabalu and nearby Mount Tambuyukon in Sabah, Malaysian Borneo. It grows in highland habitats, especially on serpentine soils rich in metals such as nickel and chromium. These challenging soils reduce competition from many other plants.

Its enormous urn-shaped pitchers made it famous, but popular stories sometimes exaggerate its ecology. It can trap rats and occasionally other small vertebrates, yet insects—especially ants—are its staple prey. The name does not honor Stamford Raffles, Hugh Low, or Joseph Dalton Hooker; those figures are connected with other parts of the plant’s history.