"Abstract Roses are incredibly diverse. It is not only about the number of cultivars (well above 25,000), but also about all possible features: colour, size, shape, growth rate, and leaf aspect. Due to these varied aspects, the system of rose classification is a very varied one: even so, some cultivars cannot be included in either category (Eckart Haenchen, M.A.S.T. 2005). As far as the flowers are concerned, some cultivars are characterised by a large number of petals, some others have fewer petals, and some have an unpleasant look because of their morphology. The most cultivated roses are scented ones and their production has turned into a real business (William Grant, 2006)."

H.Kuska comment. The actual paper appears very similar to the other.

http://journal-hfb.usab-tm.ro/engleza/2012/Lista%20lucrari%20PDF/Lucrari%2016(4)/4%20Brizu%20Diana.pdf

Here is a link that might be useful: link for above