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.
Most oak tree leaves sport a deep green hue during the summer months, but transform into red and brown colors for the fall. 1  The oak tree is one of the most colorful fall trees, which is another reason they are popular in many types of landscaping today.ehold the breadth of the oak family. There are approximately 600 individual species listed in the Quercus (Oak) genus--most are trees, though a few are shrubs. Some are deciduous, some evergreen, some semi-evergreen.