Bifolio as a functional unit?

[Koen G]

It regroups folios by Bifolium side by side. What's remarkable (in some but by no means all cases) is the similarities between colours and shapes in flowers, leaves and roots. 

Very handy! I wish this existed when Cary and I were sorting plant properties (You are not allowed to view links. Register or Login to view. ). We ended up resorting to printed bifolios, which is still the best way to get a feel for them, but this site comes close and is of course more convenient.

Sometimes plant properties appear to be bifolio based, but in my recollection this was most often a recto-verso kind of thing. But a lot of features have "buddies" spread separately over different bifolios. For example the very salient "root platforms" or "root tables" as they are sometimes called. It's almost as if these are spread out as much as possible. I agree that there are some cases where (bi)folio based groupings seem relevant, though not clear to me if it even beats chance.