Panicinae(BEAST)CAL2

xml file for phylogenetic analyses and divergence time estimation in BEAST 1.8.4 using the nucleotide substitution models unlinked across codon position, a birth-death model with incomplete sampling as tree prior, an uncorrelated lognormal clock model for the rate variation among tree branches, and a calibration based on external angiosperm fossils (eudicots and non-grass monocots) together with the controversial phytolith microfossils of Poaceae (calibration scheme 2). We used secondary calibrations in normal prior distributions for the following six crown nodes: subfamily Panicoideae (mean= 48.09.18 Mya, SD= 4.94), most recent common ancestor (MRCA) of supertribes Andropogonodae –Panicodae (mean= 36.65 Mya, SD= 3.64), supertribe Andropogonodae (mean= 34.29 Mya, SD= 3.73), tribe Andropogoneae (mean= 14.45 Mya, SD= 2.71), tribe Paspaleae (mean= 26.25 Mya, SD= 3.61), and supertribe (mean= 30.74 Mya, SD= 2.97). Analyses were conducted using three independent runs of 100 million generations, sampling every 50,000, and discarding the first 25% of each run as burn-in.