What is "marionberry"

n. A member of the blackberry family, a cross between the Chehalem and Olallieberry blackberries.

The 'Marion' cultivar (Rubus L. subgenus Rubus) or Marion blackberry, marketed as , is an indigenous blackberry developed by the USDA ARS breeding program in cooperation with Oregon State University. It is a cross between the ' Chehalem' and ' Olallie' blackberries. The marionberry is currently the most common blackberry cultivar, accounting for over half of all blackberries produced in Oregon.