Some of them are the spitting image of maple keys, only single. Technically
they are single seeded pods.
Looking at the picture of Tipuana in the field guide, I could see the
relationship. Independent parallel invention.


Iris,
Central NY, Zone 5a, Sunset Zone 40
"The trouble with people is not that they don't know but that they know so much
that ain't so."
Josh Billings (Henry Wheeler Shaw), 1818-1885