Hi RGman, Yep, the terminology has got a bit ambiguous along the way, Wikepedia even has a site on Pine Disambiguation
I think this is because the term 'pine' can be used to mean several things including,
a tree from the genus Pinus, e.g. Pinus radiata and this is often the term used by botanists,
or
coniferous trees which, as you say, includes genera such as Araucaria e.g. Araucaria bidwillii or Hoop pine, and coniferous tree is the definition for pine often used by the timber and hardware industry, at least in Australia.
While a lot of Aussies would ask for "Cypress pine" you are right, it is not of the genus Pinus and it can also be referred to as "Cypress", I have never tried doing this in a hardware store though .
Using the broader term I hope a lot of woodworkers, including guitar builders check out some pine timbers that can be great to work with. Have you checked out Huon pine? It looks fantastic.