Whom ever is trying to find the ID for this Syngonium I can send you a complete copy of Dr. Tom Croat's A REVISION OF SYNGONIUM (ARACEAE),
There are only around 30 species (probably less) so this shouldn't be difficult to key out provided you actually have the plant. You will need to be able to examine both surfaces of the blade, the petiole, the cataphyll, the stem and the inflorescence to get a positive ID. I have the paper in PDF format and will gladly share.
Send a note to:
[email protected]
Steve
