I've been redoing the decking floor and buying 5/4 x 6" premium pressure-treated boards from the local big box stores (HD or Lowes). It's not of great concern but I'm interested in what type of wood these boards are made of? I did some searching and think it may be cedar or pine. The stores do not indicate the type. There are the stamp markings but it doesn't tell me much. I bet someone savvy with wood could just tell from the grain.
When I buy these boards, what type of wood is typically used and can it vary?