Identification of any species is quite difficult. Lots of people make errors and attempt to consume a species or use it for medicine, and that is very unwise without a mentor. Even still, experts make mistakes, sometimes deadly ones.
I'm not trying to discourage you. Far from it, but I know a couple that were on vacation, and one got a small burn on themselves, perhaps as a result of a curling iron. The man found what he thought was aloe, and she applied it, and ended up getting a very bad chemical burn from whatever fluids it exuded in its stem. Very imprudent.
It takes lots and lots of research to verify and reverify, and compare pictures with standard grow lengths, and climate and known occurance in a area, and microscopic analysis, and blah, blah, blah. Be careful.
For people homeschooling, explore your land and see what you can find that naturally grows there, but first begin purchasing seeds and transplants and then study them well for use on the table,for medicinals, and for educating yourself and your children.
Plants change in appearance based upon maturity, amount of light, moisture, pH, season, etc. Learning what they look like in all seasons is the goal.
If you find a species, take pictures and bring specimens to an expert. You don't just look at one aspect of the plant, but often certain plants have distinquishing features that maybe you didn't notice, or that are unclear in one book. Look at several.
Here's one online source, but I encourage you to be an active researcher. If you know what a species is, then still make your children look it up, that is if the intention is not merely to learn but to KNOW it.
[link to www.first-nature.com
There's lots of scientific indentification sites. Go find them now...