References
Fryxell, P.A., and S.R. Hill. 2015d. Billieturnera. In Flora of North America Editorial Committee. 1993a. Flora of North America north of Mexico. Volume 1, introduction. Oxford Univ. Press, New York, NY. 372 pp. Google Scholar
Fryxell, P.A., and S.R. Hill. 2015d. Billieturnera. In Flora of North America Editorial Committee. 1993a. Flora of North America north of Mexico. Volume 1, introduction. Oxford Univ. Press, New York, NY. 372 pp. Google Scholar