As I have posted before . . .
"There was a western television series called Bonanza which ran from 1959-1973 (in the US I guess, prob a year or two later here) where the Cartwright family lived on a ranch called Ponderosa. The land attached to this (mythical) ranch was enormous and when someone saw stand 16/17 after it had been first laid associated it with that. Bloody stupid name that I always refused to use."