Arnold Arboretum - Research and educational institution in Boston. It manages a collection of hardy trees, shrubs, and vines located on 265 acres and associated herbarium and library collections. Berkshire Botanical Garden - This garden's collections emphasize plants that thrive in the Berkshires, and are displayed in an informal, country setting. Also offers community events, and classes for all ages and skill levels. The Polly Hill Arboretum - A non-profit horticultural and botanical center on Martha's Vineyard. Provides information on admission, membership, events and programs. Tower Hill Botanic Garden - Operated by Worcester County Horticultural Society, this garden features several distinctive theme areas. Information about visiting, workshops and events, history, and membership. The Botanic Garden at Smith College - A collection of thousands of plants on the college campus in Northampton, grown in the Lyman Conservatory and outdoors in various gardens, and scattered throughout the campus arboretum. Photo gallery, academic and cultural events, history, and information about the herbarium. Mount Holyoke College Botanic Garden - Greenhouse, gardens, and arboretum in South Hadley, featuring several specialty gardens and collections. Information about education, research, and annual flower show.