I’m not sure we have ever pointed to the Global Trees Campaign’s set of surveys of ex situ collections. There are individual surveys of ebony, Betulaceae, conifers, Zelkova, Rhododendron, maple, oak and Magnoliaceae, plus “Conserving the World’s Most Threatened Trees: A global survey of ex situ collections.” This came out in 2015 and includes a bunch of crop wild relatives.
