Question
I live in the St. Louis, MO area and want to identify an evergreen tree that I see frequently in this area.  It has a graceful, hanging effect of needles in branches that dangle below a main branch.  Is this a hemlock tree?

Answer
I suggest you contact the MO Department of Forestry and they should be able to ID the tree. The Forester in the St. Louis area is:
St. Louis Resource Forester
Mark Wachter
[email protected]

2751 Glencoe Rd.
Wildwod, MO 63038
Ph: 636/458-2236 ex 27

OR
St. Louis Urban Forester
Rob Emmett
[email protected]

11715 Cragwold Rd
Kirkwood, MO 63122
Ph: 314/301-1500 x 2236