Cliffrose age in relation to stem circumference and stem diameter was studied in central Utah. Age-circumference and age-diameter predictor equations were developed from material obtained from 10 stands along a 65-km section of the Wasatch Mountains foothills. Ages estimated on material of known age by the two equations were highly similar. Age predictions were more accurate for young stems than for older stems. The oldest stem aged was 163 years.
Brotherson, J. D.; Price, K. P.; and O'Rourke, L.
"Age in relationship to stem circumference and stem diameter in cliffrose (Cowania mexicana var. stansburiana) in central Utah,"
Great Basin Naturalist: Vol. 47
, Article 21.
Available at: http://scholarsarchive.byu.edu/gbn/vol47/iss2/21