The dark honey could well be from "Japanese Bamboo," which is apparently
becoming more prominent in this part of NY over the past several years.
 
The honey looks something like chocolate syrup, quite brown in color, and
has a medium-to-strong taste, not bad, to some, a bit malty.
 
Season before last we got super after super of this stuff.  Like buckwheat
it will darken up a lot of honey if mixed in.  In fact, many people have
thought for certain it was buckwheat, until they tasted it.
 
The plant is also known (perhaps more correctly) as knotweed, or smartweed,
and there are various spp.  It has very broad leaves and wispy white flower
heads.  It yields from end of July through Sept.
 
Anyway, this is my hunch.  The "corn-honey" possibilty is interesting, too,
though!
 
Regards,
 
Joel Govostes
Freeville, NY