Hardy Palm and Subtropical Board
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Posted by Brandt-San Diego on 4/23/2018, 1:45 pm, in reply to "sophora"
Hmmm...interesting. The GRIN taxonomy site lists it as only New Zealand, but that site isn't always complete either: https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?id=34960
I would imagine it originated in NZ due to the ocean currents at that latitude.
Of course, Dodonaea viscosa is the most extreme example of a plant that covers a large number of separate land masses. Ceiba pentandra is native to both Africa and the Americas since the seed is able to float and remain viable--in that case, it might have originated in Africa, though it seems to be the most common in tropical parts of the Americas (at least based on my experiences). Then there are trees where the original native range isn't 100% certain but because of the value to humans (coconuts as an example), the spread is greater than what might have occurred without assistance from humans or other animals (it's pretty obvious that coconuts can float a long ways and remain viable).
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