The distinction you make is itself difficult to judge. In my process of moving, I bare-rooted my potted plants so that they could travel with me. In the process of bare-rooting the Mandevilla, I discovered that it has tubers! A whole lot of them! I don’t recall seeing that mentioned in the Wikipedia article, and I know that I have never seen that in the pages and pages of pretty Mandevilla pictures on iNaturalist.
But:
It’s a cultivated plant, therefore not considered suitable for iNaturalist, even though this was a discovery about the species’ biology which has relevance to how it lives.
And:
The way community ID works, it wouldn’t get any agreement, and might even get bumped back to “Flowering Plants” because the cluster of tubers doesn’t include the identifying characteristics (wrong season for flowers).
Hence, I would likely post such a data point to a different platform, where it would be respected.