Super. That's it exactly.
You're right of course on the individual links. But could the society's main URL link go on the parent plant page? Someone entering info could get the link from the parent entry rather than googling or bookmarking it. Would be nice for cultivar checking especially.
The source names of the ICRAs, though, would be part of the reference drop-down list just as ITIS would be. Now looking over the list I downloaded, I don't think that all ICRA names would be needed--maybe I could narrow the list down to include only societies that are most relevant to the db, subject to everyone's approval.
Would that work?