In context, the term 'tree rose' may mean different things, but most often it refers to a standard-grafted rose. All the rose shown in this thread are cultivars that are also available more typically as shrub roses. What makes them 'tree roses' is how they are grafted.
A grafted shrub rose consists of two cultivars the desired flowering scion and the vigorous rootstock. To make a rose be a standard or 'tree' rose, a third cultivar is introduced and two grafts are performed. The third cultivar is called the 'interstem' and it provides the long main stem or 'trunk' to the standard-grafted 'tree rose. The lower end of the interstem is grafted to the rootstock and the upper end to the scion. The climbing multiflora Rosa x 'De la Grifferaie' is often used for the interstem.