I would answer here to this question from Steve Newport :
"By the way, what classifies a flower as a "Rose" because recent threads have brought up all kinds of "Roses" that don't look like the stereotypical rose at all! Not that they don't look great, just never seen THAT kind of rose before."
This drawing illustrates what is characteristic of a wild rose. And the garden roses often are different in the fact that the parts 5 and 6 are changed to petals.
Otherwise, the petals are not very important parts for botanical studies. The ratio between the other parts of the flower and the plant and their habit are much more important to separate one wild rose species from another.
In very old drawings sometimes several thousands years old, the part 3 (the "hypanthium" which will become the red hip later in the season) is the part which permits to identify a rose from any other flowers.
Here is a simple drawing using bevels, shadows, transparency, and the inner yellow parts are made with a blend.
Enjoy,
ivan
Observe Nature, re-invent the Rose
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