Figure 1

Collecting area and the number of collected species. The abbreviations denote as follow: (1) AColl. – Acer spp. collection; (2) ARBN – Arboretum Nursery; (3) BColl. – Betula spp. collection; (4) PColl. – Populus spp. collection; (5) QColl. – Quercus spp. collection; (6) AG – Aquatic Garden; (7) BG – Bamboo Garden; (8) DG – Duke’s Garden; (9) JG – Japanese Garden; (10) L – Lake; (11) MG – Mediterranean Garden; (12) NO – near Orangery; (13) P – Pond; (14) PFB – Plant Family Beds; (15) Pi – Pinetum; (16) RD – Rhododendron Dell; (17) RG – Rock Garden; (18) RK – Royals Kitchen; (19) ReG – Redwood Grove; (20) RoG – Rose Garden; (21) SVP – Student Vegetables Plot; (22) TRON – Tropical Nursery.