Stinky NM bush?
This is one of those "drive you crazy" things. I used to live in the South Valley of Albuquerque, and I recall a tree or shrub that grew along the ditch banks that smelled sort of rotten/sweet. Very strong scent. I found it not very pleasant. I cannot for the life of me remember what it was called, and I never did determine where the smell came from, so I don't know what it looked like.
Any Albuquerqeans care to guess? This stuff was all over the Bosque.