This study was initiated to further explore the hybridization patterns between the Siberian elm and the slippery elm and to document useful growth data on the hybrids. Controlled crosses between several species of elm were initiated in 1953, and early crosses and backcrosses between Siberian elm and slippery elm were compared with parent trees in several leaf, fruit, flower and vegetative bud characteristics in 1964 and again in 1970.
South Dakota State University
Collins, Paul E., "The Siberian Elm: Slippery Elm Hybrid" (1971). Agricultural Experiment Station Technical Bulletins (1939-2011). 47.