[Taxacom] Lamiaceae clade--Acanthaceae clade divergence time

[Ashley Nicholas]

Dear Taxacomers,
 
The APG website shows that two related clades -- Lamiaceae & allies and Acanthaceae & allies diverged from a common ancestor. Can anyone direct me to papers that have been published on this major dicotomy; in particular papers that might suggest a date for this divergence?
 
Thank you
Ashley Nicholas
Durban

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