Scope and Contents The letters in this collection relate mainly to Trelease’s determinations of Piperaceae, particularly Piper Linnaeus and Peperomia Ruiz & Pavon, and occasionally of Loranthaceae; a few relate to specimens of Cuscuta, sent to Yuncker through Trelease. There is also a group of letters (ca.1929) relating to a biographical memoir of John Merle Coulter, a book Trelease was writing for the National Academy of Arts...