However, Gray never went on the expedition due to taking an academic job, and Rich was appointed botanist, so they needed a new assistant.

In 1839, he collected plants in the Sydney and Hunter River districts of New South Wales, Australia.

Near Mount Shasta, he discovered the California Pitcher Plant, Darlingtonia californica, one of the noted successes of the expedition.

John Torrey chose the genus name to honor his friend, Pennsylvania botanist William Darlington.

(list not inclusive) Media related to William Dunlop Brackenridge at Wikimedia Commons