Correspondence, including letters subsequently sent as faxes, mainly with A. Peter Wharton, curator of the David C. Lam Asian Garden, University of British Columbia Botanic Garden (UBCBG), Vancouver, Canada, relating mainly to plants and trees of China, seed exchange and information about their separate plant collecting travels to China, including a report of Peter Wharton's botanical expedition to the Dalou-Shan region of Guizhou province, 1994. Includes correspondence with other botanists and Asian plant and tree specialists following Peter Wharton's death in 2008, including Douglas Justice, at University of British Columbia Botanic Garden, Dan Hinkley of Heronswood Nursery, Washington, United States of America, Mike Grant, editor, 'The Plantsman', and Bleddyn Wynn-Jones of Crûg Farm Nursery, Caernarfon
Includes cards and one photograph of Rhododendron crinigerum taken at UBCBG as part of a notecard to Roy Lancaster from Peter Wharton, 1992; Peter Wharton's curriculum vitae, 2006; copy of the Davidson Club Newsletter of the University of British Columbia, Jan 1995; details of a walking route around the David C. Lam Asian Garden; memorial service sheet for Peter Wharton, 2008, and letters from Peter Wharton's widow Sarah Wharton to Roy Lancaster, text of her memorial tribute, and Roy Lancaster's tribute produced for the RHS Rhododendron, Camellia and Magnolia Yearbook, 2009; obituary notice by Roy Lancaster for 'The Plantsman', Dec 2008