2015 July 11, Joseph L. Cotton et al., “Resolving deep relationships of PACMAD grasses: a phylogenomic approach”, in BMC Plant Biology, volume 15, →DOI:
The crown panicoid divergence date of 20.24 [7.9, 36.8] mya for set one and 23.61[8.2, 36.8] mya for set two is also of note.