A wildflower that had not been seen in nearly 70 years and was thought to have vanished from the face of the Earth has been rediscovered on Mount Diablo. The elusive Mount Diablo buckwheat, which looks like a small, pink version of the baby's breath used in floral arrangements, had been for decades the number one search target for East Bay botanists and plant enthusiasts. "It's been the Holy Grail of the East Bay," said Barbara Ertter, curator of western North American flora at the University of California's Jepson Herbarium. "It's the one plant that grows only on Mount Diablo...