[Taxacom] Euphorbiales/Malpighiales

[michael.heads at yahoo.com]

Dear Colleagues,
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Why do some authors call the?large order?including Euphorbia?'Malpighiales' instead of Euphorbiales, when Euphorbiaceae occur just about everywhere and Malpighiaceae are much less common? ?
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Michael Heads

Wellington, New Zealand.

My papers on biogeography are at the Buffalo Museum website: www.sciencebuff.org/research/current-research-activities/john-grehan/evolutionary-biography/panbiogeographic-publications/heads-publications/