Yes it is but cane is short for primocane.
Jessica M. Cortell has written: 'Effect of floricane number on primocane growth, yield components, and cold hardiness in 'Marion' trailing blackberry' -- subject(s): Blackberries, Yields, Hardiness, Pruning, Effect of cold on
Blackberries produce canes from the roots each year which only live for two years-- the first year cane, called a primocane, usually doesn't produce fruit. If it survives to the 2nd year, it's called a floricane and produces fruit and then dies, so if there are annual rings, there are only 2 of them.