Bristlecone pines

[alilach]

How can you differentiate between the Colorado bristlecone pine (Pinus aristata) and the Great Plains, or Intermountain, bristlecone (Pinus longaeva)? Thanks.

 

[John Paul Sanborn]

This is a USFS site that has a wealth of info.
http://www.fs.fed.us/database/feis/plants/tree/

This is another real good taxonomy site.
http://www.conifers.org/index.htm