I do not have the complete copy of this new paper. I am putting it here in case someone is interested in this aspect of the hips.
http://www.springerlink.com/content/p25k741669574n14/fulltext.pdf?page=1
Link: www.springerlink.com/content/p25k741669574n14/fulltext.pdf?page=1
The observation of stomata on the pericarp was published in a journal with a very similar name about a year earlier by a Chinese group. J Systematics & Evol 46:919-928 (Nov 2008)The photos are very nice and figures have legends but the rest of the text is not my cup of tea.
I believe Zielinski is the person who many years ago described the geographic distribution of R. persica (Hulthemia).