1. They encompass seven distinct arboreta organized into 50 sections. 2. Operating responsibilities were given to the Los Angeles County Department of Arboreta and Botanic Gardens. 3. Hays received the 1996 Professional Citation Award from the American Association of Botanical Gardens and Arboreta . 4. Severe bombing during World War II badly damaged the arboreta , but they have since recovered. 5. The species was never widely introduced to the United States, but is represented at several arboreta . 6. Arboreta are designated as Levels I through IV based on the number of different tree species they contain.7. Twenty arboreta have received such recognition to date, including arboreta in France, Belgium, and Korea. 8. Twenty arboreta have received such recognition to date, including arboreta in France, Belgium, and Korea. 9. "' Bedgebury National Pinetum "'at National Arboretum at Westonbirt, comprises the UK National Arboreta . 10. The park became a model for the establishment of many now-important arboreta such as in Prohonice and Konopiat. 
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