Well, if the status under Asset Tracking tool says Found, there shouldn't be any problem with it (although it's not showing the correct folder).
Important is to have the path to these assets mapped in the 3ds Max configuration: Customize - Configure User Paths - External files stored in 3dsmax.ini. The ini file is located by default here:
C:\Documents and Settings\<username>\Local Settings\Application Data\Autodesk\3dsmax\<max version>\enu\3dsmax.ini
By default our HQCatalog add-on asks you to add this path automatically. Also, generally, we recommend to resolve all references used by Forest with the Asset Tracker to absolute UNC paths. It's not necessary, but usually this way you avoid any texture path issues while using distributed rendering.
Actually, all plant libraries we resell on our website are from third-party companies - for example in case of HQ Plants series all models are done by 3D Mentor. The path comes from there and as this library is "not ours" we can't modify it's content. Thanks for your comprehension. Anyway, as I mentioned before, if the location of these files is listed under External files there shouldn't be any problem with recognizing your "local" files location.