appointed director of both the Arnold Arboretum and the Harvard Botanic Garden. In 1877, Sargent commissioned the landscape architect Frederick Law Olmsted to prepare a road and pathway system. Sargent and Olmsted would delineate the collection areas by family and genus, following the then-current and widely accepted classification system of Bentham and Hooker. The Hunnewell Building was designed by architect Alexander Wadsworth Longfellow, Jr. and constructed in 1892, with funds donated by H. H. Hunnewell. The Weld Hill Research Building opened in 2011 and has been awarded LEED Gold certification. The Arboretum has a long history of supporting plant exploration in North America, East Asia, and elsewhere. Ernest Henry Wilson was among the Arboretum's most prolific collectors in the first fifty years. He led six collecting expeditions to Eastern Asia (primarily China, Japan, and Korea) between 1899 and 1919. Many of Wilson's plants still grow in the Arboretum landscape today. In 2015, the Arboretum staff launched a 10-year collecting campaign, prioritizing the collection of nearly 400 species, of which 177 have never been cultivated at the Arboretum.From 1946 to 1950 the landscape architect Beatrix Farrand was the landscape design consultant for the Arboretum. Her early training in the 1890s included time with Charles Sprague Sargent and Jackson Thornton Dawson, the chief propagator and superintendent. Today the Arboretum occupies of land divided between four parcels, viz. the main Arboretum and the Peters Hill, Weld-Walter and South Street tracts. The collections are located primarily in the main Arboretum and on the Peters Hill tract. The Arboretum remains one of the finest examples of a landscape designed by Frederick Law Olmsted. Olmsted's office, now known as the Frederick Law Olmsted National Historic Site, is located in nearby Brookline. William (Ned) Friedman is the eighth and current Director of the Arnold Arboretum. He is also the Arnold Professor of Organismic and Evolutionary Biology at Harvard University. The Arnold Arboretum was a key reference for the establishment and development of modern botany in China, in particular the work of Chinese scholars Li Huilin, Wang Qiwu, and Hu Xiuying. Status within Boston Parks and Harvard University The Arboretum is privately endowed as a unit of Harvard University. The land was deeded to the City of Boston in 1882 and incorporated into the Olmsted-designed parkway that would become known as the Emerald Necklace. Under the agreement with the city, Harvard University was given a thousand-year lease on