Sean Houtman schreef
Doing your homework in a case like this may mean you research the
original description, which will generally start out with a bunch of
latin, and then the same stuff in another language (usually English,
but not always, depending on the native tongue of the describer).
Those descriptions often say something like "looks like
$SOMEOTHERPLANT except..." so you might want to take a look at what
that some other plant looks like.

***
Well, this is OK as far as it goes, but I would much rather recommend a good
monograph. Not only will this make a close comparison between all the
different species now known (rather than those known at the time of the
discovery of one particular species), but it will also be a lot easier to
read, especially for the layman.
PvR