Contains correspondence, annual reports, notebooks, registers, attendance lists, inventories, clippings, maps, and publications that document the fieldtrips and the herbarium organized by Connecticut Botanical Society members. Of particular interest are the early fieldtrip excursion notices and schedules which contain objectives for collecting specimens as well as transit and trolley information from the start of Connecticut Botanical Society to the current day. The herbarium materials document the creation and maintenance of the Herbarium. This includes register and guest books for visitors and those who volunteered, inventories, catalogs of the flora of Connecticut, and collectors' notebooks which contain extensive information and notes on collected botanical species.