Fig. 1From: Reconstructing an historical pollination syndrome: keel flowersThe origins of Papilionoideae clades (Clade 1–8) which evolved during 49–45.16 Ma and the origin of the evolution of keel flowers within Polygalaceae. Posterior probabilities for the key nodes are indicated. Four Fabales families, six Fabaceae subfamilies, Cercis and Xanthophyllum are indicated. Standard error bars were excluded from the figure for clearer presentation. Letters and numbers in red correspond to the calibration points. Scale bar in million yearsBack to article page