Species Royena macrocalyx

For Adriaan van Royen (1704–1779), Dutch botanist and physician, professor of botany (1732–1755) and later of medicine (1755–1775) at Leiden University, and director of the botanicalgarden at Leiden (1730–1754). He studied medicine and botany at the University of Leiden under Herman Boerhaave, and graduated as a medical doctor in 1728. He was a friend and close associate of Linnaeus (who published the genus in 1753), and a colleague of George Clifford, a wealthy English merchant and governor of the Dutch East India Company. Van Royen’s major work was Flora of Southeast Asia.