Primula longistyla, a new species of Primulaceae from Cangyuan County, Yunnan Province, China, is described and illustrated. This species is similar to P. densa, but differs clearly in that its leaves are densely white villous on both sides, homostylous flowers, exannulate corollas, longer corolla tube (2.5-2.8 cm long, ca 4 times as long as the calyx) and styles often obviously protruding from corolla tube. A comparison table of related species is provided.