The Ipswich River Wildlife Sanctuary is located in Topsfield and Wenham Massachusetts. The Rockery Trail belonged to an arboretum donated by the owner Thomas Emerson Proctor. The Sanctuary is currently managed by the Massachusetts Audubon Society who removed some of the non-native species of trees, However along the Rockery Trail I noticed some unusual trees and shrubs which managed to survive.
Thomas Emerson Proctor wrote a 430 page book titled Topsfield Arboretum Catalog of Trees and Shrubs which unfortunately is no longer in print, so it may proved to be challenging to identify some of these specimens.
January is probably not the best time for tree identification, so a return visit is planned for the warmer months.