The Top 100 Threatened Species list just released by IUCN, including in a nifty online booklet with nice photos, includes two crop wild relatives: Dioscorea strydomiana from South Africa and Lathyrus belinensis from Turkey. The yam is down to 250 plants and is threatened by harvesting, the vetch down to 1,000, with building work encroaching the population. But in both cases, there is seed conserved ex situ. Surely there are some CWRs that are more threatened than that? Maybe even some wild tomatoes.