* Common name: There might be a variety of blackberry or raspberry that is commonly called "Rubus valentine." However, without further context, it's hard to know for sure.
* Misspelling: The name could be a misspelling of a different Rubus species. For example, "Rubus vallis-clausa" is a species of blackberry.
* Cultivar: It could be a specific cultivar of a Rubus species, meaning a variety selected for particular traits, such as fruit size or flavor.
To help me identify what "Rubus valentine" is, please provide more context:
* Where did you see this name? (A book, website, plant label, etc.)
* What kind of plant are you looking for? (A blackberry, raspberry, etc.)
* Do you have any other details about the plant? (Its appearance, growing habits, etc.)
With more information, I can help you find out what "Rubus valentine" refers to.