An arboretum is a botanical collection composed exclusively of trees of a variety of species. Originally mostly created as a section in a larger garden or park for specimens of mostly non-local species, many modern arboreta are in botanical gardens as living collections of woody plants and are intended at least in part for scientific study.
Autumn colours at Westonbirt Arboretum, Gloucestershire, England
The pinetum section at RHS Wisley
Neptune's fountain at Trsteno Arboretum
Hatanpää Arboretum, a 20th-century botanical garden in Tampere, Finland
A botanical garden or botanic garden is a garden with a documented collection of living plants for the purpose of scientific research, conservation, display, and education. It is their mandate as a botanical garden that plants are labelled with their botanical names. It may contain specialist plant collections such as cacti and other succulent plants, herb gardens, plants from particular parts of the world, and so on; there may be glasshouses or shadehouses, again with special collections such as tropical plants, alpine plants, or other exotic plants that don't grow natively within that region.
Orto botanico di Pisa operated by the University of Pisa: the first university botanic garden in Europe, established in 1544 under botanist Luca Ghini, it was relocated in 1563 and again in 1591.
Royal Botanical Garden of Madrid, Madrid, Spain
The New Brunswick Botanical Garden, Canada
Seiwa-en Japanese Garden, Missouri Botanical Garden, US