Coevolution between Two Epicephala and Two Breynia Figure 6. Flowers and fruits of Breynia plants. Male flowers of B. fruticosa (A) and B. rostrata (B) with stamens concealed in calyxe which can be visited by Epicephala moths only. Female flowers (C) and fruit (D) of B. fruticosa with excurved stigmas and discal calyx sepals. Female flowers (E) and fruit (F) of B. rostrata with stigmas erect and reflexed calyx sepals. (cs) calyx sepals. (s) stigma. doi:10.1371/journal.pone.0041657.g006 Materials and Methods Study Sites From November 2009 to September 2011, we carried out field observations on Breynia fruticosa in Yingge Mountain Nature Reserves (alt. 200–755 m, 18u509–19u129N, 109u159–109u509E), Wuzhi Mountain National Nature Reserves (alt. 512–720 m, 18u499–18u599N, 109u329–109u439E) and Jianfeng Mountain National Nature Reserves (alt. 807–973 m, 18u239–18u529N, 108u449–109u029E) in Hainan, China; and on B. fruticosa and B. PLoS ONE | www.plosone.org 7 July 2012 | Volume 7 | Issue 7 | e41657