In casual terms even by nurseries and universities who should know better, “salicina” is lumping quite a few diploid plum-type species under the same banner. True salicina, americana, cerasifera, maritima, besseyi, simoni, cordata, nigra, pumila and others have been used in the parentage of modern “salicina” plums.
On a different note, Mr. Burbank used to encourage people to plant the seeds of any locally grown fruit tree that was exceptional. 
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