Are you saying LR doesn't have the lens to manually choose or that LR doesn't automatically choose it and you have to choose it manually?
If the lens is not there to choose manually then are you editing a JPG or other non-raw-format image? Most lens corrections are only for raw files.
If you can choose it manually then once you have, click the Setup choices and choose Save New Lens Profile Default and set your LR Default Lens Profile Setup to Default instead of Auto. Default is the same as Auto except if you have specified a default lens profile then it'll use that, instead:
Here is what I'm seeing for Nikon lens choices in LR CC and at least one 16-35 is listed:
I guess I should do lens corrections in my RAW images before I run HDR on each group of seven images (bracketed). I was making adjustments after the HDR JPG was created.
If you do the HDR in LR6/CC or ACR 9, you'll still have a raw-ish (linear DNG) image that can have lens-corrections applied to it assuming the sources images were raws.
If you have a non-RAW at the end of PS HDR Pro then you can apply a lens-correction in the Photoshop Filter panel. That filter allows applying raw profiles to non-raw images because it's impossible to work with a raw file in PS proper, only in the plug-in.
What you can't do is use LR or the ACR plug-in to apply lens corrections to a non-raw unless the profile actually is made for non-raw images.
Yes, you should do lens corrections before doing HDR or pano merges.
Thank you ssprengel and ManiacJoe!
the Nikon 16-35mm f/4 definitely shows up automatically for me in Lightroom CC.