It sounds like you are describing what locals called dewberries when I lived
in north florida. The bramble family are all pretty closely related. I think
it's either the same species as blackberry with some local characteristics,
or a very close relative.
"Eric Gibson" wrote in message
news:cEKRf.138236$0G.61009@dukeread10...
Hey, I found a specimen of this wild black blackberry that I know grows
around here in north central florida... Can someone help me ID it?

The only example I could find on the web with the same qualities was
something like this, and it didn't have the genus/species or name:

http://www.alamedainfo.com/Alameda_C...ay_30_2005.jpg

but the stem is green, and the thorns aren't as pronounced. It's leaves
are
in groups of 3, perfectly oval shaped (unlike the picture) and never get
longer than an inch even when the plant is full grown. They'll grow in
brambles, but I don't think they grow in vines or arches, more like big
clumps of the bushes they grow as when I see them alone. I would just say
it's a blackberry and leave it at that, except the leaves are oval and
smaller... The berries taste and look like blackberries.

Eric