Larix kongboensis, a new species from southeastern Xizang (China) near its borders with Arunachal Pradesh (India), is described. Previously misidentified as L. mastersiana, its affinities with that Sichuan endemic and with L. grffithii (eastern Himalaya) and L. speciosa (Yunnan, Myanmar) are discussed. Within L. potaninii Batalin, variety aus- tralis A. Henry ex Handel-Mazzetti has been found to be an earlier name for variety macrocarpa Y. W. Law. The nomenclature of the Sikkim Larch is