In New Jersey we have:
Wineberry (R. phoenicolasias): fuzzy red stems
Black raspberry (R. occidentalis): blue-white, round stems
(Red raspberry) (R. idaeus) (mostly north of NJ): blue-green, round stems
Cut-leaved blackberry (R. laciniatus): deeply lobed leaflets
Sand blackberry (R. cuneatus): wedge-shaped, smallish leaflets
Purple flowering raspberry (R. odoratus): leaves not divided, currant or maple-like
Common dewberry (R. flagellaris): trailing with prickles on stems, dull leaves
Swamp dewberry (R. hispidus): trailing with bristles and some prickles on stems, shiny leaves
Common blackberry (R. allegheniensis): fluted stems, flowers in clusters of more than 12, glandular flowerstalks
Pennsylvania blackberry (R. pensylvanicus): fluted stems, flowers in clusters of fewer than 12, not very glandular.
Tough to separate the last two.
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