Merriam-Webster Online Dictionary
boysenberry (noun) a large reddish black fruit with a raspberry flavor , also the trailing hybrid bramble yielding this fruit and developed by crossing several blackberries and raspberries
Boysenberry (Wikipedia)
The boysenberry /ˈbɔɪzənbɛri/ is a cross between the European raspberry (Rubus idaeus), European blackberry (Rubus fruticosus), American dewberry (Rubus aboriginum), and loganberry (Rubus × loganobaccus).
| Rubus ursinus × R. idaeus | |
|---|---|
| |
| Boysenberries in various stages of development | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Rosales |
| Family: | Rosaceae |
| Tribe: | Rubeae |
| Genus: | Rubus |
| Subgenus: | |
| Species: | |
It is a large 8.0-gram (0.28 oz) aggregate fruit, with large seeds and a deep maroon color.
