Actually, you're in luck! There are several university based weed and
plant ID databases that cover hundreds of species and allow you to
select plant features interactively. If you look up the EWIRM database
you can find them listed by state or province. Several name or keyword
search databases are also listed on EWIRM which cover many more plant
species (thousands).

Best of luck on your plant ID quest.
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EWIRM: Nature makes plants, humans make weeds!