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.
of organism. For example, Quercus garryana is the scientific name for garry oak. The name of a genus is one word, such as Quercus (the oaks), and can be used alone, whereas the name of any species must include the generic name and the species name, such as Quercus garryana.he ordering of diversity into a recognizable pattern is the basis of any classification scheme. Studies of pre-European indigenous cultures have shown that there is a distinct correlation between the use of language and the ordering of organisms into a few accessible categories that are hierarchical in form.