Genetic diversity within and among populations of Neopicrorhiza scrophulariiflora (Scrophulariaceae) in China, an endangered medicinal plant

► High level of genetic diversity at the species level in N. scrophulariiflora. ► Low level of genetic diversity within populations in N. scrophulariiflora. ► Large genetic differentiation in natural populations of N. scrophulariiflora. ► Genetic differentiation does not completely correlate with geographic distance.