There are multiple types of dystonia, and numerous diseases and conditions may cause dystonia.
Oak is the most common name for trees listed in the genus Quercus. There are a few species that exhibit a shrub type growth form instead of a tree form.There are both deciduous and evergreen species and some are semi-evergreen.Currently there are approximately 600 different species listed in the Quercus (Oak) genus.The tree name  Oak  is also used for the common names of some species in related genera, especially those listed in the Lithocarpus genus.ome evergreen Oak trees (especially certain American Species) are given a grouping common name called Live Oak. This name applies to different species that have an evergreen growth habit, and does not reflect any taxonomic classification group, as these species are distantly related in some cases.
The evergreen oak (Quercus Ilex) is a tree of the family Fagaceae, with perennial leaves, typical of the Mediterranean area. So that, in Spain this is the commonest forest species: around three million hectares of oak woods distributed all over the Iberian Peninsula and the Balearic Islands.It is also called carrasca, chaparra or chaparro.t is a medium-length tree, which may reach 16 to 25 metres high, mainly cultivated in order to obtain its fruits, the well-known acorns. It is a very long-live tree, since in Spain we have specimens possibly aging a thousand years.