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  Re: [Aroid-l] Adelonema
From: Peter Boyce <phymatarum at googlemail.com> on 2011.11.23 at 09:03:11(22375)
Dear Christopher,

Gondwana is almost certainly the place of origin of the lineage that led to modern aroids. As to age, currently the ‘agreed’-upon molecular clock age is [stem-group] Araceae have been dated to ca 131 million years before present, [crown group] Araceae to ca 128 million years ago (Janssen & Bremer 2004).

Dates for Alismatales [stem-group] are to ca 131 million years before present, [crown group] Alismatales to ca 128 million years before present (Janssen & Bremer 2004; ca 133 and 103 million years before present respectively in Bremer 2000); Magalln & Castillo (2009) suggest ca 147 million years for relaxed and 126 million years for constrained penalized likelihood datings of the beginning of divergence within Alismatales - these dates are probably underestimates [dates presented here are paraphrased from APG http://www.mobot.org/MOBOT/research/APWeb/]




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