Main Difference
The main difference between Boysenberry and Marionberry is that the Boysenberry is a cross between a European Raspberry (Rubus idaeus), a Common Blackberry (Rubus fruticosus), an American Dewberry (Rubus aboriginum) and a Loganberry (Rubus × loganobaccus) and Marionberry is a Blackberry Cultivar.
Boysenberry
The boysenberry is a cross among the European raspberry (Rubus idaeus), European blackberry (Rubus fruticosus), American dewberry (Rubus aboriginum), and loganberry (Rubus × loganobaccus).It is a large 8.0-gram (0.28 oz) aggregate fruit, with large seeds and a deep maroon color.
Marionberry
The ‘Marion’ cultivar (Rubus L. subgenus Rubus) or Marion blackberry, marketed as marionberry , is a 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.
Boysenberry (noun)
A hybrid berry created from crossing blackberry, red raspberry, and loganberry.
Marionberry (noun)
A member of the blackberry family, a cross between the Chehalem and Olallieberry blackberries.