Maximum Likelihood phylogram of Fagopyrum as inferred from analysis of the combined cpDNA dataset of accD, matK, psbA-trnH, rbcL and trnL-F. Support values ≥ 50% BS or 0.90 PP are displayed above the branches, respectively. The two black boxes covered the cymosum group and the urophyllum group as defined in Yasui and Ohnishi (1998a), respectively. The green box indicates the third group, namely the tibeticum group, as revealed in the present study. The representative photos in the circles showing the inflorescences and the fruits of urophyllum group, tibeticum group and cymosum group are F. urophyllum, F. tibeticum and F. dibotrys, respectively. All photos were taken by Bo Li.