Boston Globe: ON AN OVERCAST, late-July morning, a five-car caravan of environmentalists arrived at a patch of North Carolina forest in the Smoky Mountains. Armed with shovels and 3-gallon buckets for watering, they unloaded several 2-foot specimens of Torreya taxifolia, a gangly, long-needled pine tree native to North Florida. Only several hundred Torreya pines remain in the wild, clinging to a few ravines by Florida’s Apalachicola River, less than 1 percent of the stock a century ago. Most of the …