The Arnold Arboretum Horticultural Library and Archives is a specialized collection devoted to the study of temperate woody plants. We collect works on botany, horticulture, floras, landscape studies, and dendrology. The library houses more than 40,000 volumes. The Visual Image Collection contains more than 65,000 photographs, and includes a significant historical image collection. The Archive Collection documents the Arboretum’s history and is a repository for nineteenth, twentieth, and twenty-first century horticultural and botanical collections.