Here’s why lesser-known varieties are winning over sommeliers, winemakers, and drinkers seeking fresher, more distinctive American wines.Credit: Courtesy of Megan Clark and Landmass WinesGrape vines around the world crossbreed readily, which means the possibilities for new fruit are infinite. To date, more than 1,000 grape varieties have been documented. While certain ones, like Cabernet Sauvignon , Chardonnay, and Riesling, are beloved househol…