Burns, Doane, Swecker & Mathis, L.L.P.
Marianna plum rootstock variety named `M40`
 A new and distinct cultivar of Marianna rootstock that originated as an open-pollinated seedling is provided. The new cultivar is particularly well suited for use as prune rootstock. When compared to the previously utilized Marianna `2624` cultivar, it is found that the new cultivar exhibits superior root anchorage and a significantly reduced tendency to form unwanted suckers. Also, the new cultivar when compared per se to the Marianna `2624` cultivar is found to set considerably more fruit, to form smaller fruit, and to possess a pit that is considerably smaller. Good wet soil tolerance is exhibited. The new cultivar propagates well by the use of cuttings. 
Regents of the University of California
Claron O. James F. Robert E.
Hesse, deceased Doyle Fenton