Philodendrons fall into several major groups - the "tree" types (meconostigmas), the viners, and the creepers. James, yours is in the meconostigma group. They are generally distinguished by their heavy trunks with close-set leaf scars. Viners, well, vine with long internodes and the need to climb up trees, cliffs, or other surfaces (sides of houses?). These can be confused with "pothos" (really Epipremnum) plants that also vine and look a lot like philos. Both Philodendron and Epipremnum are aroids, but different genera. The creepers have shorter internodes than viners and "creep" on the ground. A good example of a creeper is Philodendron gloriosum.