Original: Subspecies Subspecies Taxon author Common name Geographic range T. j. bourreti Klemmer , 1963 Bourret 's pitviper Northwestern Vietnam ( in the provinces of Lao Cai and Lai Chau , and possibly also in adjascent China ( Yunnan ) .
Simplified: Geographic range T. j. bourreti Klemmer , 1963 Bourret 's pitviper Northwestern Vietnam ( in the provinces of Lao Cai and Lai Chau , and possibly also in adjascent China ( Yunnan ) .