Greene ...
I just Googled "Dictionary of botanical terms" and happened to come up with a site I use a lot.
You can always Google "Anatomy of "XXXX" plant" and you will generally get a list of several horticultural sites. Often these sites are maintained by universities with horticultural or agriculture departments.
Note: They are dangerous sites ...not really
It's just that once you start reading about something, you start reading about something else, and then you read further and hours have gone by ...
They often list good books to read to study various aspects of botany.
Smiles,
Lyn
