Identification: Vine Like, Purple stems, Thorns

This plant is growing in the park near my house. There's lots of Himalayan Blackberry growing in the park and I spent about a month and a half last winter removing as much of it as I could and plan to remove some more this winter.

This plant is different than Himalayan Blackberry though, it's more vine like, the stems are smaller and the leaves are different.

I'm wondering if this is Trailing Blackberry which is native here, or if it is something else.

If it's a native plant, I'll leave it alone and if it's non native I'll remove it.

Thanks for any help.

 

Trailing blackberry.

 

Thanks Ron.

 

When you find ones with no telltale fruits it can be because this species is represented partly by male individuals that do not produce flowers with functioning female parts - same as with certain familiar garden subjects like Actinidia, Aucuba and Skimmia.