The canister attaches in the area of the RH sway bar brackets but if you have lost the check valve, then it is likely you have lost the canister as well. The emission stuff was one of the first things removed from the car over the years so its not unsurprising that all of yours is gone and you can either choose to replace it or just remove the old piping and go to a normal (non-Californian) set-up. If you choose to leave the line in-place then its not going to hurt anything.
That hose looks a bit odd as the A/C drain normally sits lower in the floor-pan, to give the water a vertical drop. Maybe one of those strange modifications that has happened over the years?
Brad