Measurements were made of morphological characteristics of ephemeral and persistent leaves of three subspecies of big sagebrush (Artemisia tridentata Nutt.) grown in a uniform environment. No morphological feature clearly separated the subspecies. Genetic-environmental interactions on leaf morphology apparently reduce its value as a sole criterion for distinguishing the subspecies.
McDonough, W. T.; Harniss, R. O.; and Campbell, R. B.
"Morphology of ephemeral and persistent leaves of three subspecies of big sagebrush grown in a uniform environment,"
Great Basin Naturalist: Vol. 35
, Article 10.
Available at: http://scholarsarchive.byu.edu/gbn/vol35/iss3/10