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Named for Bernard McMahon (1775-1816) Irish/American horticulturist, by Thomas Nuttal in 1818.
Oakeley, Dr. Henry F. (2013). Wellcome Library notes. Link
Kew says this is an unplaced name
Plants of the World online, Kew Science http://plantsoftheworldonline.org/taxon/urn:lsid:ipni.org:names:107539-1 Link
Genus named for Bernard M'Mahon (1775-1816), American Horticulturist.
Stearn, W.T.. (1996). Dictionary of Plant Names for Gardeners. Cassell.