There has been a feature request to have “useful comments” incorporated somehow into taxa pages. The About tab can link to external info, so I think that is where this will go… in the mean time, there is nothing like “just giving it a go”, capture features that make it different from others in the same class or family, etc. Your “standard set” for plants/trees seems spot on, and will usually get you most of the way, and then just be bold and ask IDers and commenters questions that might lead to learning moments!