Not to be semantically confused with :
Himalayan Clematis (Clematis montana),
Himalayan Crane's-bill (Geranium himalayense), Himalayan Honeysuckle (Leycesteria formosa),
Himalayan Bistort (Persicaria affinis),
Himalayan Knotweed (Persicaria wallichii),
Himalayan Sorbaria (Sorbaria tomentosa),
Himalayan Spiraea (Spiraea canescens), Himalayan Balsam (aka Indian Balsam) (Impatiens glandulifera), [a plant with similar name]
Easily mistaken for : many other
Brambles (Rubus species)
There are 334 microspecies of Bramble: they hybridise and back-cross with one another. Most Brambles are tetraploid (have 4 sets of chromosomes [normally, humans have but 2]) but there also exist species of Bramble which are triploid, pentaploid, haxaploid and heptaploid. Rubus armeniacus is tetraploid.
However, there exists one exception: Rubus ulmifolius (a plant not shown here and apparently lacking a common name, as many brambles do) is rather special: it is the only diploid (that is, has only 2 sets of chromosomes) and the only wholly sexual microspecies of Bramble.
The black fruit is small on this species. Rubus frruits are an aggregate fruit, containing many drupelets. It is usually called a
Blackberry. Blackberries grow on all Brambles, of which there are about 334 differing ones in the UK, but they hybridise between themselves too. All the fruits on Brambles are nominally edible, when ripe, which occurs after they have darkened from red to black. Blackberry pickers would have to be botany specialists if they really wanted to know exactly which of the ~334 bramble species they were actually picking... But it really doesn't matter, although indubitably some are tastier than others, some bigger than others, etc.
It is one of the larger brambles which are proliferating all over the place, transforming good land into impenetrable thickets. It occurs widely in the UK, especially on clay or chalk where fewer other microspecies of Rubus are to be found. Because of these soil preferences it is the commonest microspecies in several locations of the UK and Channel Islands.
Brambles are the curse of walkers, ripping trousers, socks, hands and legs and generally forming an impenetrable barrier to progress, much like the rampant Gorse which invades footpaths and ways.