I did some blackberry pulling up top today, and figured out how to identify the different types (so I can leave the trailing native)
The native type has 3 leaves on each stem. The top leaf has two sticky outy (scientific language) lobes at the base.
Evergreen has 3 leaves as well, but the base leaves have the pokey lobes, and the top leaf is rounded. It also look more ruffly all around, the stem is reddish, and it has denser thorns on the stem.
Himalayan has 5 leaves. Easy peasy