Dated origin of Arabidopsis thaliana - 13 Mya

This paper gave much more robust dating for origin of Arabidopsis thaliana:

Dated molecular phylogenies indicate a Miocene origin for Arabidopsis thaliana

http://www.pnas.org/content/107/43/18724.long

We bring previously overlooked fossil evidence to bear on these questions and find the split between A. thaliana and Arabidopsis lyrata occurred about 13 Mya, and that Arabidopsis and the Brassica complex (broccoli, cabbage, canola) occurred about 43 Mya.