Yucca harrimaniae var. sterilis Neese & Welsh is named and described from the Uinta Basin of Utah. The plant is strongly rhizomatous, evidently sterile, and has limber, sparingly filiferous leaves that tend to recline on the ground.
Neese, Elizabeth and Welsh, Stanley L.
"New variety of Yucca harrimaniae (Agavaceae) from Utah,"
Great Basin Naturalist: Vol. 45
, Article 14.
Available at: http://scholarsarchive.byu.edu/gbn/vol45/iss4/14