garden dewberry R. aboriginum Rydb. Reported in AL, GA & TN
Allegheny Blackberry R. allegheniensis Porter Cleburn Co.
oldfield blackberry R. alumnus L.H. Bailey Reported in TN
falling dewberry R. apogaeus L.H. Bailey Reported in
Sawtooth blackberry R. argutus Link Native but invasive in HI
Himalayan blackberry R. armeniacus Focke Exotic reported
in
field blackberry R. arvensis L.H. Bailey Reported in
Bailey’s dewberry R. baileyanus Britton Reported in TN
Himalayan blackberry R. bifrons Vest ex Tratt. Exotic in NW
smooth blackberry R. canadensis L. GA & TN Mtn.
sand blackberry R. cuneifolius Pursh Native mostly S.
Deam’s dewberry R. deamii L.H. Bailey Reported in TN
DC dewberry R. fecundus L.H. Bailey Reported in AL & TN
northern dewberry R. flagellaris Willd. Native
Yankee blackberry R. frondosus Bigelow Reported in GA & TN
bristly dewberry R hispidus L. Franklin Co. TN
Savanna dewberry R. ictus L.H. Bailey Reported in AL & GA
American red raspberry R. idaeus L. NE TN
otherwise circumpolar
Upland dewberry R. invisus (L.H. Bailey) Britton Reported in TN
Cutleaf blackberry R. laciniatus Willd. exotic SE & NE TN
Plains blackberry R. laudatus A. Berger Reported in AL, GA & TN
Bottomland dewberry R. leviculus L.H. Bailey Reported in GA
Manatee dewberry R. lucidus Rydb. Reported in GA
Dryslope dewberry R. meracus L.H. Bailey Reported in TN
Black raspberry R. occidentalis L. Native just into
Purpleflowering raspberry R.
odoratus L. TN
& GA Adj. to
Persistent blackberry R. persistens Rydb. Reported in AL & GA
Wine raspberry R. phoenicolasius Maxim. Exotic [
Tree blackberry R. probabilis L.H. Bailey Reported in AL & GA
Plymoth blackberry R. randolphiorum L.H. Bailey Reported in AL & GA
Branched blackberry R. suus L.H. Bailey Reported in AL, GA & TN
southern dewberry R. trivialis Michx. Native
Wharton’s dewberry R. whartoniae L.H. Bailey Reported in TN
Boysenberry = dewberry X Loganberry where loganberry is more important as breeding stock than for fruit.
Youngberry = blackberry X dewberry
olallieberry = Loganberry X Youngberry
Marionberry = olallieberry X Chehalem berry whose parent is Himalayan and grandparents are Loganberry and California blackberry
Another notable species is thimbleberry, R. parviflorus Nutt., which I have seen at Philmont Scout Ranch in New Mexico. The thimbleberries were not ripe but a few raspberries were.
There are simple difference between the blackberries, raspberries and dewberries found here in northeast Alabama. Dewberries are a trailing vine that runs along the ground and may even root at nodes, unfortunately they seem to be declining due to herbicides. The blackberries and raspberries are both upright or arching, while the tips of raspberries sometimes or at least more often touches the ground and roots. The fruit of raspberries totally separates from the supporting structures and thus appear hollow.
Blackberries are aggregate fruits that develop from separate ovules in a single flower thus pollination is very important to ensure the maximum number of drupelets are produced. Mulberries, Morus L., look similar to blackberries but they are multiple fruits produced from a cluster of individual flowers. The degree of pollination can be strongly influenced by the weather, whether it be rain, heat, or in the worst but fortunately least likely case of cold that could damage the blossoms. As a bonus blackberries are good honey plants. If it is too hot bees may not be out all day. Rain can wash the pollen away before the bees get covered with it. Similar to Indian summer in autumn there is blackberry winter in the spring. This follows dogwood winter, which is typically the last freeze. While blackberry winter is just the last cool weather before May. It is probably synonymous with strawberry winter, which is often blamed for damaging strawberries because they are at ground level and thus more susceptible to a late frost.
Blackberries are easy to grow because wild ones will appear if you do nothing such as neglecting to mow a lawn for a few years. Blackberry patches have a reputation for chiggers and snakes, but both these are exaggerated. The chiggers were probably in the vegetation such as grass surrounding the patch while the snakes if any are usually only looking for bird nests. Some people even suspect the presence of snakes due to the "snake spit" they often see on blackberries, but this so called snake spit is actually produced by a spittle bug nymph that is hiding by blowing bubbles in sap oozing from a wound that it created.
Commercial production is different so these issues are mute, but many people don't like the larger commercial blackberries because the seeds are proportionally larger but the flavor isn't especially on thorn-less varieties. The advantage of the improved varieties is the larger crops, but if the orchard is not well maintained it is no better than a wild patch. A typical method is to have a (relatively light) trellis, with a couple of wires. Each plant is allowed to produce a couple of pimacanes but only after the berry season ends. These cane are cut when they reach the respective wire (i.e. taller to the upper wire) to encourage lateral buds to grow and the resulting branches are tied to the wires. One person after initially experiencing the u-pick harvest at Petals from the Past described it as a sin for it to be that easy to pick a couple gallons of blackberries, but they planned on "sinning" again within a week. A variation on the trellis is a couple wires at the same height where one is for the primocanes and the other is for the floracanes while this alternates each year, but the spacing between plants seems to be larger in this case while it saves the steps of keeping primocanes cut back until time for harvest and then pruning them to the height of the wires. The former method is also used for raspberries.