Relict stands of Pinus edulis and P. monophylla, and of natural hybrids of these species have been found in Cache and Rich counties. The stands and their sites are described. The P. edulis stand in Rich County extends the range of this species northward. Possible means of seed dissemination are discussed and it is speculated that both species formerly migrated into and out of this area during periods of differing climates.
Lanner, Ronald M. and Hutchinson, Earl R.
"Relict stands of pinyon hybrids in northern Utah,"
Great Basin Naturalist: Vol. 32
, Article 4.
Available at: http://scholarsarchive.byu.edu/gbn/vol32/iss3/4