The Nellie Cory Cactus is on the U.S. Endangered Species List. It is classified as endangered in Texas. Large numbers of this little cactus used to grow near roadways in the Chihuahuan Desert, where they were easily taken by cacti enthusiasts. Prized among these poachers for its beautiful flowers, the Nellie Cory Cactus has been so over-collected that it survives in only three locations, all on privately held land in Brewster County.