Not officially identified as a cultivar of B.oldhamii. It certainly resembles oldhamii. Some people feel it's superior as a landscape specimen and for construction material. Very rare in the mainland of the United States. A timber bamboo, which was said to be brought to Hawaii from India. When first planted in Hawaii it grew to 6” in diameter with thick walls. The original five plants all seeded and died, producing only one seed that germinated. From that seed, this current strain, now grows to 5” in diameter. Some of the culm sections are oval but most are round. Very straight culms and reach 60'- 70' tall with thin, strong walls and long internodes. Min USDA zone 9a. Click to find your zone.