Many threatened or understudied oak tree species are at risk of extinction in Southeast and East Asia, where more than half of their native range is subject to sharply increasing human pressure. Should these species of oak disappear from the wild, most of them do not have a single backup in a managed botanical collection anywhere in the world. Those are among the findings in the first comprehensive Conservation Gap Analysis of Select Native Asian Oaks, conducted by scientists at The Morton Arboretum alongside collaborators in the region. Oaks are a crucial species that anchor entire ecosystems—supplying food and shelter for humans and wildlife alike—and by addressing vast disparities in data about these at-risk trees, this report informs the most practical next steps for conserving them.